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Attenuation coefficient

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1769: 1358: 1995:, or "dB", where 10 dB represents attenuation by a factor of 10. The units for attenuation coefficient are thus dB/m (or, in general, dB per unit distance). Note that in logarithmic units such as dB, the attenuation is a linear function of distance, rather than exponential. This has the advantage that the result of multiple attenuation layers can be found by simply adding up the dB loss for each individual passage. However, if intensity is desired, the logarithms must be converted back into linear units by using an exponential: 1764:{\displaystyle {\begin{aligned}\mu &=\mu _{\mathrm {a} }+\mu _{\mathrm {s} },\\\mu _{\nu }&=\mu _{\mathrm {a} ,\nu }+\mu _{\mathrm {s} ,\nu },\\\mu _{\lambda }&=\mu _{\mathrm {a} ,\lambda }+\mu _{\mathrm {s} ,\lambda },\\\mu _{\Omega }&=\mu _{\mathrm {a} ,\Omega }+\mu _{\mathrm {s} ,\Omega },\\\mu _{\Omega ,\nu }&=\mu _{\mathrm {a} ,\Omega ,\nu }+\mu _{\mathrm {s} ,\Omega ,\nu },\\\mu _{\Omega ,\lambda }&=\mu _{\mathrm {a} ,\Omega ,\lambda }+\mu _{\mathrm {s} ,\Omega ,\lambda }.\end{aligned}}} 1265: 1031: 2697: 1260:{\displaystyle {\begin{aligned}\mu _{\Omega ,\nu }&=-{\frac {1}{L_{\mathrm {e} ,\Omega ,\nu }}}{\frac {\mathrm {d} L_{\mathrm {e} ,\Omega ,\nu }}{\mathrm {d} z}},\\\mu _{\Omega ,\lambda }&=-{\frac {1}{L_{\mathrm {e} ,\Omega ,\lambda }}}{\frac {\mathrm {d} L_{\mathrm {e} ,\Omega ,\lambda }}{\mathrm {d} z}},\end{aligned}}} 1774:
Just looking at the narrow beam itself, the two processes cannot be distinguished. However, if a detector is set up to measure beam leaving in different directions, or conversely using a non-narrow beam, one can measure how much of the lost radiant flux was scattered, and how much was absorbed.
254:. The attenuation coefficient is dependent upon the type of material and the energy of the radiation. Generally, for electromagnetic radiation, the higher the energy of the incident photons and the less dense the material in question, the lower the corresponding attenuation coefficient will be. 830: 2430: 1950: 1786:
loss of narrow-beam intensity, including scattering as well. "Narrow-beam attenuation coefficient" always unambiguously refers to the latter. The attenuation coefficient is at least as large as the absorption coefficient; they are equal in the idealized case of no scattering.
979: 729: 357: 2293: 2858: 2144:-fold reductions that occur over a unit length of material, this coefficient measures how many 10-fold reductions occur: a decadic coefficient of 1 m means 1 m of material reduces the radiation once by a factor of 10. 1324:. Absorption indicates energy that is lost from the beam, while scattering indicates light that is redirected in a (random) direction, and hence is no longer in the beam, but still present, resulting in diffuse light. 735: 2692:{\displaystyle {\begin{aligned}\mu (z)&=\sum _{i=1}^{N}\mu _{i}(z)=\sum _{i=1}^{N}\sigma _{i}n_{i}(z),\\\mu _{10}(z)&=\sum _{i=1}^{N}\mu _{10,i}(z)=\sum _{i=1}^{N}\varepsilon _{i}c_{i}(z),\end{aligned}}} 492: 1858: 884: 69:. A coefficient value that is large represents a beam becoming 'attenuated' as it passes through a given medium, while a small value represents that the medium had little effect on loss. The (derived) 634: 2392: 2944:(HVL) is the thickness of a layer of material required to reduce the radiant flux of the transmitted radiation to half its incident magnitude. The half-value layer is about 69% (ln 2) of the 2921: 2435: 1363: 1036: 2980: 2135: 4069:
Tables of X-Ray Mass Attenuation Coefficients and Mass Energy-Absorption Coefficients from 1 keV to 20 MeV for Elements Z = 1 to 92 and 48 Additional Substances of Dosimetric Interest
281: 2172: 2059: 527: 576: 104:
one meter) thickness of material, so that an attenuation coefficient of 1 m means that after passing through 1 metre, the radiation will be reduced by a factor of
596: 547: 426: 406: 3810: 4073: 3877: 2987: 2792: 3998: 825:{\displaystyle \mu _{\lambda }=-{\frac {1}{\Phi _{\mathrm {e} ,\lambda }}}{\frac {\mathrm {d} \Phi _{\mathrm {e} ,\lambda }}{\mathrm {d} z}},} 2948:. Engineers use these equations predict how much shielding thickness is required to attenuate radiation to acceptable or regulatory limits. 434: 1815:. Assuming that dz is so small that there will be no overlap of the cross section areas, the total area available for absorption will be 1945:{\displaystyle {\frac {\mu }{\rho _{m}}},\quad {\frac {\mu _{\mathrm {a} }}{\rho _{m}}},\quad {\frac {\mu _{\mathrm {s} }}{\rho _{m}}},} 974:{\displaystyle \mu _{\Omega }=-{\frac {1}{L_{\mathrm {e} ,\Omega }}}{\frac {\mathrm {d} L_{\mathrm {e} ,\Omega }}{\mathrm {d} z}},} 724:{\displaystyle \mu _{\nu }=-{\frac {1}{\Phi _{\mathrm {e} ,\nu }}}{\frac {\mathrm {d} \Phi _{\mathrm {e} ,\nu }}{\mathrm {d} z}},} 3760: 1317: 17: 4039: 3919: 2329: 2869: 1778:
In this context, the "absorption coefficient" measures how quickly the beam would lose radiant flux due to the absorption
2412:
The (Napierian) attenuation coefficient and the decadic attenuation coefficient of a material sample are related to the
2158:
rather than just simply "attenuation coefficient". The terms "decadic" and "Napierian" come from the base used for the
2089: 2973: 3939: 352:{\displaystyle \mu =-{\frac {1}{\Phi _{\mathrm {e} }}}{\frac {\mathrm {d} \Phi _{\mathrm {e} }}{\mathrm {d} z}},} 1307: 2288:{\displaystyle T=e^{-\int _{0}^{\ell }\mu (z)\mathrm {d} z}=10^{-\int _{0}^{\ell }\mu _{10}(z)\mathrm {d} z},} 2753: 247: 70: 4109: 3830: 1998: 1835: 500: 136: 4063: 1352:
The attenuation coefficient of a volume is the sum of absorption coefficient and scattering coefficients:
552: 1988: 206: 106: 130:
counts forward-scattered radiation as transmitted rather than attenuated, and is more applicable to
3765: 30:
For "attenuation coefficient" as it applies to electromagnetic theory and telecommunications, see
3815: 3314:, divided by the spectral radiance incident onto that surface. This should not be confused with " 2956: 2715: 4031: 4068: 188: 1795:
The absorption coefficient may be expressed in terms of a number density of absorbing centers
152:
of a beam is reduced as it passes through a specific material. It is used in the context of:
3840: 3790: 3775: 2772: 2417: 2163: 2159: 31: 8: 4114: 3770: 2406: 2402: 131: 100:
distance of the original intensity as the energy of the intensity passes through a unit (
4058: 3264:, divided by the radiance incident onto that surface. This should not be confused with " 4119: 4024: 3991:"Thermal insulation — Heat transfer by radiation — Physical quantities and definitions" 3825: 3805: 3785: 581: 532: 411: 391: 3935: 246:
A small attenuation coefficient indicates that the material in question is relatively
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Dukhin, A.S. and Goetz, P.J. "Ultrasound for characterizing colloids", Elsevier, 2002
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The attenuation coefficient is called the "extinction coefficient" in the context of
90: 4083: 3958:
ISO 20998-1:2006 "Measurement and characterization of particles by acoustic methods"
3887: 4087: 4078: 4019: 3891: 3882: 3845: 2941: 1316:) beam passes through a volume, the beam will lose intensity due to two processes: 1313: 251: 221: 74: 4095:
Error in template * unknown parameter name (GoldBookRef): "access-date"
3899:
Error in template * unknown parameter name (GoldBookRef): "access-date"
3820: 174: 3835: 3795: 2952: 2853:{\displaystyle \varepsilon _{i}={\frac {N_{\text{A}}}{\ln {10}}}\,\sigma _{i},} 2734: 2413: 3229:, divided by that received by that surface. This should not be confused with " 3189:, divided by that received by that surface. This should not be confused with " 2783:
by definition of attenuation cross section and molar attenuation coefficient.
4103: 4082:, 2nd ed. (the "Gold Book") (1997). Online corrected version: (2006–) " 3886:, 2nd ed. (the "Gold Book") (1997). Online corrected version: (2006–) " 3855: 3555: 3524: 3488: 3462: 2306: 49:
characterizes how easily a volume of material can be penetrated by a beam of
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for a material sample, in which the two attenuation coefficients take part:
1829: 3800: 2786:
Attenuation cross section and molar attenuation coefficient are related by
1965: 855: 844: 371: 149: 3990: 140:
is the attenuation coefficient normalized by the density of the material.
110:, and for material with a coefficient of 2 m, it will be reduced twice by 3780: 3416: 3385: 3349: 3323: 3273: 3238: 3198: 3168: 86: 82: 232:, albeit usually denoted with another symbol (given the standard use of 181:(although actually it is not a section dimensionally speaking), denoted 3315: 3265: 3230: 3190: 3118: 3083: 3047: 3021: 1321: 229: 202: 160: 94: 2315:
is the path length of the beam of light through the material sample.
487:{\displaystyle \Phi _{\mathrm {e} }=\Phi _{\mathrm {e0} }e^{-\mu z}} 1790: 1294: 1281: 992: 225: 58: 384:
Note that for an attenuation coefficient which does not vary with
2140:
Just as the usual attenuation coefficient measures the number of
1992: 1982: 1971: 601: 196: 170: 998: 66: 62: 148:
The attenuation coefficient describes the extent to which the
156: 54: 50: 4059:
Absorption Coefficients α of Building Materials and Finishes
612:
spectral hemispherical attenuation coefficient in wavelength
1349:, are defined the same way as the attenuation coefficient. 608:
spectral hemispherical attenuation coefficient in frequency
4018: 3748:
per unit length, divided by that received by that volume.
3698:
per unit length, divided by that received by that volume.
3663:
per unit length, divided by that received by that volume.
3623:
per unit length, divided by that received by that volume.
2955:. Moreover, it is very closely related to the attenuation 1987:
Engineering applications often express attenuation in the
1009:
spectral directional attenuation coefficient in wavelength
1830:
Mass attenuation, absorption, and scattering coefficients
1301: 1005:
spectral directional attenuation coefficient in frequency
4064:
Sound Absorption Coefficients for Some Common Materials
3811:
Computation of radiowave attenuation in the atmosphere
2387:{\displaystyle T=e^{-\mu \ell }=10^{-\mu _{10}\ell }.} 862: 3910:
Serway, Raymond; Moses, Clement; Moyer, Curt (2005).
2951:
Attenuation coefficient is also inversely related to
2872: 2795: 2433: 2332: 2175: 2092: 2001: 1861: 1811:, the total number of absorbing centers contained is 1361: 1034: 887: 738: 637: 584: 555: 535: 503: 437: 414: 394: 284: 2916:{\displaystyle c_{i}={\frac {n_{i}}{N_{\text{A}}}},} 250:, while a larger value indicates greater degrees of 4023: 2915: 2852: 2691: 2386: 2287: 2129: 2053: 1944: 1763: 1259: 973: 824: 723: 590: 570: 541: 521: 486: 420: 400: 351: 2962: 2130:{\displaystyle \mu _{10}={\frac {\mu }{\ln 10}}.} 118:. Other measures may use a different factor than 81:is another term for this quantity, often used in 4101: 3961: 3909: 1791:Expression in terms of density and cross section 3985: 3983: 3981: 3979: 3977: 3975: 3973: 2863:and number density and amount concentration by 1819:and the fraction of radiation absorbed is then 1782:, while "attenuation coefficient" measures the 3629:Spectral hemispherical attenuation coefficient 1972:Napierian and decadic attenuation coefficients 602:Spectral hemispherical attenuation coefficient 3914:. California, USA: Brooks/Cole. p. 529. 2981: 2156:Napierian narrow beam attenuation coefficient 93:of intensity, that is, the value of downward 3970: 3936:"2nd Edition of the Glossary of Meteorology" 3704:Spectral directional attenuation coefficient 3593:, divided by that received by that surface. 3550:, divided by that received by that surface. 3519:, divided by that received by that surface. 3483:, divided by that received by that surface. 3457:, divided by that received by that surface. 3411:, divided by that received by that surface. 3380:, divided by that received by that surface. 3344:, divided by that received by that surface. 999:Spectral directional attenuation coefficient 388:, this equation is solved along a line from 2074:decadic narrow beam attenuation coefficient 257: 89:. Most commonly, the quantity measures the 3928: 3873: 3871: 2988: 2974: 262: 3952: 3163:at the same temperature as that surface. 3113:at the same temperature as that surface. 3078:at the same temperature as that surface. 3042:at the same temperature as that surface. 2836: 4012: 27:Light or sound absorption in a substance 3868: 2063: 14: 4102: 3761:Absorption (electromagnetic radiation) 1302:Absorption and scattering coefficients 3599:Hemispherical attenuation coefficient 2054:{\displaystyle I=I_{o}10^{-(dB/10)}.} 1823:. The absorption coefficient is thus 522:{\displaystyle \Phi _{\mathrm {e0} }} 3489:Spectral hemispherical transmittance 2323:attenuation, these relations become 1799:and an absorbing cross section area 571:{\displaystyle \Phi _{\mathrm {e} }} 3669:Directional attenuation coefficient 869:directional attenuation coefficient 863:Directional attenuation coefficient 856:spectral radiant flux in wavelength 47:narrow-beam attenuation coefficient 24: 4079:Compendium of Chemical Terminology 4030:. Dover Publications Inc. p.  3883:Compendium of Chemical Terminology 3556:Spectral directional transmittance 3350:Spectral hemispherical reflectance 3199:Spectral hemispherical absorptance 2273: 2218: 1921: 1891: 1743: 1736: 1716: 1709: 1685: 1662: 1655: 1635: 1628: 1604: 1587: 1580: 1566: 1559: 1541: 1517: 1496: 1454: 1433: 1397: 1382: 1240: 1226: 1219: 1209: 1192: 1185: 1153: 1131: 1117: 1110: 1100: 1083: 1076: 1044: 958: 950: 943: 933: 922: 915: 893: 845:spectral radiant flux in frequency 809: 794: 789: 784: 766: 761: 708: 693: 688: 683: 665: 660: 562: 557: 529:is the incoming radiation flux at 510: 505: 459: 454: 444: 439: 336: 327: 322: 317: 305: 300: 128:broad-beam attenuation coefficient 73:of attenuation coefficient is the 25: 4131: 4052: 3048:Spectral hemispherical emissivity 2152:Napierian attenuation coefficient 3581: 3538: 3507: 3471: 3445: 3417:Spectral directional reflectance 3399: 3368: 3332: 3302: 3274:Spectral directional absorptance 3252: 3217: 3177: 3147: 3097: 3066: 3030: 3940:American Meteorological Society 3119:Spectral directional emissivity 3109:, divided by that emitted by a 2070:decadic attenuation coefficient 1912: 1882: 1295:spectral radiance in wavelength 380:is the path length of the beam. 124:decadic attenuation coefficient 3903: 3014: 2963:Other radiometric coefficients 2679: 2673: 2626: 2620: 2573: 2567: 2547: 2541: 2494: 2488: 2447: 2441: 2269: 2263: 2214: 2208: 2043: 2026: 1308:Optical extinction coefficient 1282:spectral radiance in frequency 628:respectively, are defined as: 39:linear attenuation coefficient 13: 1: 3861: 2754:molar attenuation coefficient 1025:respectively, are defined as 3831:Mass attenuation coefficient 1842:mass attenuation coefficient 1836:Mass attenuation coefficient 137:mass attenuation coefficient 7: 3754: 3463:Hemispherical transmittance 2775:of the attenuating species 2756:of the attenuating species 2737:of the attenuating species 2718:of the attenuating species 1976: 1850:mass scattering coefficient 1846:mass absorption coefficient 143: 10: 4136: 4020:Subrahmanyan Chandrasekhar 1980: 1833: 1305: 228:radiative transfer in the 207:particle size distribution 29: 3525:Directional transmittance 3324:Hemispherical reflectance 3169:Hemispherical absorptance 3005: 3002: 2999: 578:is the radiation flux at 179:macroscopic cross section 3766:Absorption cross section 3022:Hemispherical emissivity 258:Mathematical definitions 4092:10.1351/goldbook.A00037 3896:10.1351/goldbook.A00516 3888:Attenuation coefficient 3816:Cross section (physics) 3386:Directional reflectance 3239:Directional absorptance 3159:, divided by that of a 3074:, divided by that of a 3070:Spectral exitance of a 3038:, divided by that of a 2969:Radiometry coefficients 2779:in the material sample, 2760:in the material sample; 2741:in the material sample; 2722:in the material sample; 2424:attenuating species as 2309:of the material sample; 269:attenuation coefficient 263:Attenuation coefficient 43:attenuation coefficient 4084:Absorption coefficient 3651:Spectral radiant flux 3084:Directional emissivity 3034:Radiant exitance of a 2917: 2854: 2693: 2652: 2603: 2520: 2477: 2388: 2289: 2131: 2055: 1946: 1765: 1340:scattering coefficient 1329:absorption coefficient 1261: 975: 826: 725: 592: 572: 543: 523: 488: 422: 402: 353: 209:, where it is denoted 191:, where it is denoted 189:ultrasound attenuation 163:, where it is denoted 79:Extinction coefficient 18:Absorption coefficient 2918: 2855: 2694: 2632: 2583: 2500: 2457: 2418:amount concentrations 2409:theory for instance. 2401:attenuation occur in 2389: 2290: 2132: 2056: 1947: 1803:. For a slab of area 1766: 1342:of a volume, denoted 1331:of a volume, denoted 1306:Further information: 1262: 1011:of a volume, denoted 976: 871:of a volume, denoted 827: 726: 614:of a volume, denoted 593: 573: 544: 524: 489: 423: 403: 354: 271:of a volume, denoted 177:, where it is called 3841:Propagation constant 3776:Acoustic attenuation 2870: 2793: 2773:amount concentration 2431: 2330: 2173: 2150:is sometimes called 2090: 2064:Naperian attenuation 1999: 1859: 1359: 1032: 885: 736: 635: 582: 553: 533: 501: 435: 412: 392: 282: 32:Attenuation constant 4110:Physical quantities 3771:Absorption spectrum 3316:spectral absorbance 3231:spectral absorbance 2996: 2714:is the attenuation 2407:radiation shielding 2403:atmospheric science 2252: 2204: 205:for characterizing 167:and measured in cm; 132:radiation shielding 4026:Radiative Transfer 3826:High-energy X-rays 3806:Compton scattering 3786:Attenuation length 3736:Spectral radiance 3585:Spectral radiance 3449:Spectral radiance 3306:Spectral radiance 3151:Spectral radiance 2967: 2913: 2850: 2689: 2687: 2384: 2285: 2238: 2190: 2127: 2051: 1942: 1761: 1759: 1257: 1255: 971: 822: 721: 588: 568: 539: 519: 484: 418: 398: 349: 213:and measured in m. 185:and measured in m; 4041:978-0-486-60590-6 3921:978-0-534-49339-4 3851:Scattering theory 3752: 3751: 2946:penetration depth 2935:Avogadro constant 2908: 2905: 2834: 2818: 2405:applications and 2122: 1989:logarithmic units 1937: 1907: 1877: 1825:μ = n σ 1248: 1203: 1139: 1094: 966: 927: 817: 778: 716: 677: 591:{\displaystyle z} 542:{\displaystyle z} 421:{\displaystyle z} 401:{\displaystyle z} 344: 311: 242:for slant paths); 91:exponential decay 16:(Redirected from 4127: 4096: 4046: 4045: 4029: 4016: 4010: 4009: 4007: 4006: 3987: 3968: 3965: 3959: 3956: 3950: 3949: 3947: 3946: 3932: 3926: 3925: 3907: 3901: 3900: 3875: 3846:Radiation length 3791:Beer–Lambert law 3730: 3718: 3680: 3645: 3638: 3605: 3579: 3567: 3536: 3505: 3498: 3469: 3443: 3431: 3397: 3366: 3359: 3330: 3300: 3288: 3250: 3215: 3208: 3175: 3145: 3133: 3095: 3064: 3057: 3028: 3016: 2997: 2990: 2983: 2976: 2966: 2942:half-value layer 2922: 2920: 2919: 2914: 2909: 2907: 2906: 2903: 2897: 2896: 2887: 2882: 2881: 2859: 2857: 2856: 2851: 2846: 2845: 2835: 2833: 2832: 2820: 2819: 2816: 2810: 2805: 2804: 2698: 2696: 2695: 2690: 2688: 2672: 2671: 2662: 2661: 2651: 2646: 2619: 2618: 2602: 2597: 2566: 2565: 2540: 2539: 2530: 2529: 2519: 2514: 2487: 2486: 2476: 2471: 2414:number densities 2393: 2391: 2390: 2385: 2380: 2379: 2375: 2374: 2354: 2353: 2294: 2292: 2291: 2286: 2281: 2280: 2276: 2262: 2261: 2251: 2246: 2226: 2225: 2221: 2203: 2198: 2164:Beer–Lambert law 2136: 2134: 2133: 2128: 2123: 2121: 2107: 2102: 2101: 2083:, is defined as 2060: 2058: 2057: 2052: 2047: 2046: 2039: 2017: 2016: 1951: 1949: 1948: 1943: 1938: 1936: 1935: 1926: 1925: 1924: 1914: 1908: 1906: 1905: 1896: 1895: 1894: 1884: 1878: 1876: 1875: 1863: 1770: 1768: 1767: 1762: 1760: 1753: 1752: 1739: 1726: 1725: 1712: 1695: 1694: 1672: 1671: 1658: 1645: 1644: 1631: 1614: 1613: 1591: 1590: 1583: 1570: 1569: 1562: 1545: 1544: 1528: 1527: 1520: 1507: 1506: 1499: 1482: 1481: 1465: 1464: 1457: 1444: 1443: 1436: 1419: 1418: 1402: 1401: 1400: 1387: 1386: 1385: 1266: 1264: 1263: 1258: 1256: 1249: 1247: 1243: 1237: 1236: 1235: 1222: 1212: 1206: 1204: 1202: 1201: 1188: 1175: 1163: 1162: 1140: 1138: 1134: 1128: 1127: 1126: 1113: 1103: 1097: 1095: 1093: 1092: 1079: 1066: 1054: 1053: 980: 978: 977: 972: 967: 965: 961: 955: 954: 953: 946: 936: 930: 928: 926: 925: 918: 905: 897: 896: 878:, is defined as 831: 829: 828: 823: 818: 816: 812: 806: 805: 804: 797: 787: 781: 779: 777: 776: 769: 756: 748: 747: 730: 728: 727: 722: 717: 715: 711: 705: 704: 703: 696: 686: 680: 678: 676: 675: 668: 655: 647: 646: 597: 595: 594: 589: 577: 575: 574: 569: 567: 566: 565: 548: 546: 545: 540: 528: 526: 525: 520: 518: 517: 516: 493: 491: 490: 485: 483: 482: 467: 466: 465: 449: 448: 447: 427: 425: 424: 419: 407: 405: 404: 399: 358: 356: 355: 350: 345: 343: 339: 333: 332: 331: 330: 320: 314: 312: 310: 309: 308: 295: 275:, is defined as 241: 195:and measured in 175:nuclear reactors 75:reciprocal metre 21: 4135: 4134: 4130: 4129: 4128: 4126: 4125: 4124: 4100: 4099: 4094: 4055: 4050: 4049: 4042: 4017: 4013: 4004: 4002: 4001:catalogue. 1989 3989: 3988: 3971: 3966: 3962: 3957: 3953: 3944: 3942: 3934: 3933: 3929: 3922: 3908: 3904: 3898: 3876: 3869: 3864: 3821:Grey atmosphere 3757: 3729: 3720: 3719: 3717: 3708: 3679: 3673: 3644: 3640: 3639: 3637: 3633: 3603: 3578: 3569: 3568: 3566: 3560: 3535: 3529: 3504: 3500: 3499: 3497: 3493: 3467: 3442: 3433: 3432: 3430: 3421: 3396: 3390: 3365: 3361: 3360: 3358: 3354: 3328: 3299: 3290: 3289: 3287: 3278: 3249: 3243: 3214: 3210: 3209: 3207: 3203: 3173: 3144: 3135: 3134: 3132: 3123: 3094: 3088: 3063: 3059: 3058: 3056: 3052: 3026: 2995: 2994: 2965: 2932: 2902: 2898: 2892: 2888: 2886: 2877: 2873: 2871: 2868: 2867: 2841: 2837: 2828: 2821: 2815: 2811: 2809: 2800: 2796: 2794: 2791: 2790: 2770: 2751: 2732: 2713: 2686: 2685: 2667: 2663: 2657: 2653: 2647: 2636: 2608: 2604: 2598: 2587: 2576: 2561: 2557: 2554: 2553: 2535: 2531: 2525: 2521: 2515: 2504: 2482: 2478: 2472: 2461: 2450: 2434: 2432: 2429: 2428: 2370: 2366: 2362: 2358: 2343: 2339: 2331: 2328: 2327: 2272: 2257: 2253: 2247: 2242: 2234: 2230: 2217: 2199: 2194: 2186: 2182: 2174: 2171: 2170: 2111: 2106: 2097: 2093: 2091: 2088: 2087: 2082: 2066: 2035: 2022: 2018: 2012: 2008: 2000: 1997: 1996: 1985: 1979: 1974: 1963: 1931: 1927: 1920: 1919: 1915: 1913: 1901: 1897: 1890: 1889: 1885: 1883: 1871: 1867: 1862: 1860: 1857: 1856: 1852:are defined as 1838: 1832: 1793: 1758: 1757: 1735: 1734: 1730: 1708: 1707: 1703: 1696: 1684: 1680: 1677: 1676: 1654: 1653: 1649: 1627: 1626: 1622: 1615: 1603: 1599: 1596: 1595: 1579: 1578: 1574: 1558: 1557: 1553: 1546: 1540: 1536: 1533: 1532: 1516: 1515: 1511: 1495: 1494: 1490: 1483: 1477: 1473: 1470: 1469: 1453: 1452: 1448: 1432: 1431: 1427: 1420: 1414: 1410: 1407: 1406: 1396: 1395: 1391: 1381: 1380: 1376: 1369: 1362: 1360: 1357: 1356: 1348: 1337: 1312:When a narrow ( 1310: 1304: 1292: 1279: 1254: 1253: 1239: 1238: 1218: 1217: 1213: 1208: 1207: 1205: 1184: 1183: 1179: 1174: 1164: 1152: 1148: 1145: 1144: 1130: 1129: 1109: 1108: 1104: 1099: 1098: 1096: 1075: 1074: 1070: 1065: 1055: 1043: 1039: 1035: 1033: 1030: 1029: 1024: 1017: 1001: 990: 957: 956: 942: 941: 937: 932: 931: 929: 914: 913: 909: 904: 892: 888: 886: 883: 882: 877: 865: 853: 842: 808: 807: 793: 792: 788: 783: 782: 780: 765: 764: 760: 755: 743: 739: 737: 734: 733: 707: 706: 692: 691: 687: 682: 681: 679: 664: 663: 659: 654: 642: 638: 636: 633: 632: 627: 620: 604: 583: 580: 579: 561: 560: 556: 554: 551: 550: 534: 531: 530: 509: 508: 504: 502: 499: 498: 472: 468: 458: 457: 453: 443: 442: 438: 436: 433: 432: 413: 410: 409: 393: 390: 389: 369: 335: 334: 326: 325: 321: 316: 315: 313: 304: 303: 299: 294: 283: 280: 279: 265: 260: 233: 146: 35: 28: 23: 22: 15: 12: 11: 5: 4133: 4123: 4122: 4117: 4112: 4098: 4097: 4071: 4066: 4061: 4054: 4053:External links 4051: 4048: 4047: 4040: 4011: 3969: 3960: 3951: 3927: 3920: 3912:Modern Physics 3902: 3866: 3865: 3863: 3860: 3859: 3858: 3853: 3848: 3843: 3838: 3836:Mean free path 3833: 3828: 3823: 3818: 3813: 3808: 3803: 3798: 3796:Cargo scanning 3793: 3788: 3783: 3778: 3773: 3768: 3763: 3756: 3753: 3750: 3749: 3734: 3731: 3724: 3712: 3706: 3700: 3699: 3684: 3681: 3677: 3671: 3665: 3664: 3649: 3646: 3642: 3635: 3631: 3625: 3624: 3609: 3606: 3601: 3595: 3594: 3583: 3580: 3573: 3564: 3558: 3552: 3551: 3540: 3537: 3533: 3527: 3521: 3520: 3511:Spectral flux 3509: 3506: 3502: 3495: 3491: 3485: 3484: 3473: 3470: 3465: 3459: 3458: 3447: 3444: 3437: 3425: 3419: 3413: 3412: 3401: 3398: 3394: 3388: 3382: 3381: 3372:Spectral flux 3370: 3367: 3363: 3356: 3352: 3346: 3345: 3334: 3331: 3326: 3320: 3319: 3304: 3301: 3294: 3282: 3276: 3270: 3269: 3254: 3251: 3247: 3241: 3235: 3234: 3221:Spectral flux 3219: 3216: 3212: 3205: 3201: 3195: 3194: 3179: 3176: 3171: 3165: 3164: 3149: 3146: 3139: 3127: 3121: 3115: 3114: 3099: 3096: 3092: 3086: 3080: 3079: 3068: 3065: 3061: 3054: 3050: 3044: 3043: 3032: 3029: 3024: 3018: 3017: 3012: 3008: 3007: 3004: 3001: 2993: 2992: 2985: 2978: 2970: 2968: 2964: 2961: 2953:mean free path 2930: 2924: 2923: 2912: 2901: 2895: 2891: 2885: 2880: 2876: 2861: 2860: 2849: 2844: 2840: 2831: 2827: 2824: 2814: 2808: 2803: 2799: 2781: 2780: 2766: 2761: 2747: 2742: 2735:number density 2728: 2723: 2709: 2700: 2699: 2684: 2681: 2678: 2675: 2670: 2666: 2660: 2656: 2650: 2645: 2642: 2639: 2635: 2631: 2628: 2625: 2622: 2617: 2614: 2611: 2607: 2601: 2596: 2593: 2590: 2586: 2582: 2579: 2577: 2575: 2572: 2569: 2564: 2560: 2556: 2555: 2552: 2549: 2546: 2543: 2538: 2534: 2528: 2524: 2518: 2513: 2510: 2507: 2503: 2499: 2496: 2493: 2490: 2485: 2481: 2475: 2470: 2467: 2464: 2460: 2456: 2453: 2451: 2449: 2446: 2443: 2440: 2437: 2436: 2395: 2394: 2383: 2378: 2373: 2369: 2365: 2361: 2357: 2352: 2349: 2346: 2342: 2338: 2335: 2317: 2316: 2310: 2296: 2295: 2284: 2279: 2275: 2271: 2268: 2265: 2260: 2256: 2250: 2245: 2241: 2237: 2233: 2229: 2224: 2220: 2216: 2213: 2210: 2207: 2202: 2197: 2193: 2189: 2185: 2181: 2178: 2138: 2137: 2126: 2120: 2117: 2114: 2110: 2105: 2100: 2096: 2080: 2065: 2062: 2050: 2045: 2042: 2038: 2034: 2031: 2028: 2025: 2021: 2015: 2011: 2007: 2004: 1981:Main article: 1978: 1975: 1973: 1970: 1959: 1953: 1952: 1941: 1934: 1930: 1923: 1918: 1911: 1904: 1900: 1893: 1888: 1881: 1874: 1870: 1866: 1834:Main article: 1831: 1828: 1807:and thickness 1792: 1789: 1772: 1771: 1756: 1751: 1748: 1745: 1742: 1738: 1733: 1729: 1724: 1721: 1718: 1715: 1711: 1706: 1702: 1699: 1697: 1693: 1690: 1687: 1683: 1679: 1678: 1675: 1670: 1667: 1664: 1661: 1657: 1652: 1648: 1643: 1640: 1637: 1634: 1630: 1625: 1621: 1618: 1616: 1612: 1609: 1606: 1602: 1598: 1597: 1594: 1589: 1586: 1582: 1577: 1573: 1568: 1565: 1561: 1556: 1552: 1549: 1547: 1543: 1539: 1535: 1534: 1531: 1526: 1523: 1519: 1514: 1510: 1505: 1502: 1498: 1493: 1489: 1486: 1484: 1480: 1476: 1472: 1471: 1468: 1463: 1460: 1456: 1451: 1447: 1442: 1439: 1435: 1430: 1426: 1423: 1421: 1417: 1413: 1409: 1408: 1405: 1399: 1394: 1390: 1384: 1379: 1375: 1372: 1370: 1368: 1365: 1364: 1346: 1335: 1303: 1300: 1299: 1298: 1290: 1285: 1277: 1268: 1267: 1252: 1246: 1242: 1234: 1231: 1228: 1225: 1221: 1216: 1211: 1200: 1197: 1194: 1191: 1187: 1182: 1178: 1173: 1170: 1167: 1165: 1161: 1158: 1155: 1151: 1147: 1146: 1143: 1137: 1133: 1125: 1122: 1119: 1116: 1112: 1107: 1102: 1091: 1088: 1085: 1082: 1078: 1073: 1069: 1064: 1061: 1058: 1056: 1052: 1049: 1046: 1042: 1038: 1037: 1022: 1015: 1000: 997: 988: 982: 981: 970: 964: 960: 952: 949: 945: 940: 935: 924: 921: 917: 912: 908: 903: 900: 895: 891: 875: 864: 861: 860: 859: 851: 848: 840: 833: 832: 821: 815: 811: 803: 800: 796: 791: 786: 775: 772: 768: 763: 759: 754: 751: 746: 742: 731: 720: 714: 710: 702: 699: 695: 690: 685: 674: 671: 667: 662: 658: 653: 650: 645: 641: 625: 618: 603: 600: 587: 564: 559: 538: 515: 512: 507: 495: 494: 481: 478: 475: 471: 464: 461: 456: 452: 446: 441: 417: 397: 382: 381: 375: 367: 360: 359: 348: 342: 338: 329: 324: 319: 307: 302: 298: 293: 290: 287: 264: 261: 259: 256: 244: 243: 215: 214: 200: 186: 168: 145: 142: 122:, such as the 26: 9: 6: 4: 3: 2: 4132: 4121: 4118: 4116: 4113: 4111: 4108: 4107: 4105: 4093: 4089: 4085: 4081: 4080: 4075: 4072: 4070: 4067: 4065: 4062: 4060: 4057: 4056: 4043: 4037: 4033: 4028: 4027: 4021: 4015: 4000: 3996: 3995:ISO 9288:1989 3992: 3986: 3984: 3982: 3980: 3978: 3976: 3974: 3964: 3955: 3941: 3937: 3931: 3923: 3917: 3913: 3906: 3897: 3893: 3889: 3885: 3884: 3879: 3874: 3872: 3867: 3857: 3856:Transmittance 3854: 3852: 3849: 3847: 3844: 3842: 3839: 3837: 3834: 3832: 3829: 3827: 3824: 3822: 3819: 3817: 3814: 3812: 3809: 3807: 3804: 3802: 3799: 3797: 3794: 3792: 3789: 3787: 3784: 3782: 3779: 3777: 3774: 3772: 3769: 3767: 3764: 3762: 3759: 3758: 3747: 3743: 3739: 3735: 3732: 3728: 3723: 3716: 3711: 3707: 3705: 3702: 3701: 3697: 3693: 3689: 3685: 3682: 3676: 3672: 3670: 3667: 3666: 3662: 3658: 3654: 3650: 3647: 3632: 3630: 3627: 3626: 3622: 3618: 3614: 3611:Radiant flux 3610: 3607: 3602: 3600: 3597: 3596: 3592: 3588: 3584: 3577: 3572: 3563: 3559: 3557: 3554: 3553: 3549: 3545: 3541: 3532: 3528: 3526: 3523: 3522: 3518: 3514: 3510: 3492: 3490: 3487: 3486: 3482: 3478: 3475:Radiant flux 3474: 3466: 3464: 3461: 3460: 3456: 3452: 3448: 3441: 3436: 3429: 3424: 3420: 3418: 3415: 3414: 3410: 3406: 3402: 3393: 3389: 3387: 3384: 3383: 3379: 3375: 3371: 3353: 3351: 3348: 3347: 3343: 3339: 3336:Radiant flux 3335: 3327: 3325: 3322: 3321: 3317: 3313: 3309: 3305: 3298: 3293: 3286: 3281: 3277: 3275: 3272: 3271: 3267: 3263: 3259: 3255: 3246: 3242: 3240: 3237: 3236: 3232: 3228: 3224: 3220: 3202: 3200: 3197: 3196: 3192: 3188: 3184: 3181:Radiant flux 3180: 3172: 3170: 3167: 3166: 3162: 3158: 3154: 3150: 3143: 3138: 3131: 3126: 3122: 3120: 3117: 3116: 3112: 3108: 3104: 3100: 3091: 3087: 3085: 3082: 3081: 3077: 3073: 3069: 3051: 3049: 3046: 3045: 3041: 3037: 3033: 3025: 3023: 3020: 3019: 3013: 3010: 3009: 2998: 2991: 2986: 2984: 2979: 2977: 2972: 2971: 2960: 2958: 2957:cross section 2954: 2949: 2947: 2943: 2938: 2936: 2929: 2910: 2899: 2893: 2889: 2883: 2878: 2874: 2866: 2865: 2864: 2847: 2842: 2838: 2829: 2825: 2822: 2812: 2806: 2801: 2797: 2789: 2788: 2787: 2784: 2778: 2774: 2769: 2765: 2762: 2759: 2755: 2750: 2746: 2743: 2740: 2736: 2731: 2727: 2724: 2721: 2717: 2716:cross section 2712: 2708: 2705: 2704: 2703: 2682: 2676: 2668: 2664: 2658: 2654: 2648: 2643: 2640: 2637: 2633: 2629: 2623: 2615: 2612: 2609: 2605: 2599: 2594: 2591: 2588: 2584: 2580: 2578: 2570: 2562: 2558: 2550: 2544: 2536: 2532: 2526: 2522: 2516: 2511: 2508: 2505: 2501: 2497: 2491: 2483: 2479: 2473: 2468: 2465: 2462: 2458: 2454: 2452: 2444: 2438: 2427: 2426: 2425: 2423: 2419: 2415: 2410: 2408: 2404: 2400: 2381: 2376: 2371: 2367: 2363: 2359: 2355: 2350: 2347: 2344: 2340: 2336: 2333: 2326: 2325: 2324: 2322: 2314: 2311: 2308: 2307:transmittance 2304: 2301: 2300: 2299: 2282: 2277: 2266: 2258: 2254: 2248: 2243: 2239: 2235: 2231: 2227: 2222: 2211: 2205: 2200: 2195: 2191: 2187: 2183: 2179: 2176: 2169: 2168: 2167: 2165: 2161: 2157: 2153: 2149: 2145: 2143: 2124: 2118: 2115: 2112: 2108: 2103: 2098: 2094: 2086: 2085: 2084: 2079: 2075: 2071: 2061: 2048: 2040: 2036: 2032: 2029: 2023: 2019: 2013: 2009: 2005: 2002: 1994: 1990: 1984: 1969: 1967: 1962: 1958: 1939: 1932: 1928: 1916: 1909: 1902: 1898: 1886: 1879: 1872: 1868: 1864: 1855: 1854: 1853: 1851: 1847: 1843: 1837: 1827: 1826: 1822: 1818: 1817:n A σ dz 1814: 1810: 1806: 1802: 1798: 1788: 1785: 1781: 1776: 1754: 1749: 1746: 1740: 1731: 1727: 1722: 1719: 1713: 1704: 1700: 1698: 1691: 1688: 1681: 1673: 1668: 1665: 1659: 1650: 1646: 1641: 1638: 1632: 1623: 1619: 1617: 1610: 1607: 1600: 1592: 1584: 1575: 1571: 1563: 1554: 1550: 1548: 1537: 1529: 1524: 1521: 1512: 1508: 1503: 1500: 1491: 1487: 1485: 1478: 1474: 1466: 1461: 1458: 1449: 1445: 1440: 1437: 1428: 1424: 1422: 1415: 1411: 1403: 1392: 1388: 1377: 1373: 1371: 1366: 1355: 1354: 1353: 1350: 1345: 1341: 1334: 1330: 1325: 1323: 1319: 1315: 1309: 1296: 1289: 1286: 1283: 1276: 1273: 1272: 1271: 1250: 1244: 1232: 1229: 1223: 1214: 1198: 1195: 1189: 1180: 1176: 1171: 1168: 1166: 1159: 1156: 1149: 1141: 1135: 1123: 1120: 1114: 1105: 1089: 1086: 1080: 1071: 1067: 1062: 1059: 1057: 1050: 1047: 1040: 1028: 1027: 1026: 1021: 1014: 1010: 1006: 996: 994: 987: 968: 962: 947: 938: 919: 910: 906: 901: 898: 889: 881: 880: 879: 874: 870: 857: 849: 846: 838: 837: 836: 819: 813: 801: 798: 773: 770: 757: 752: 749: 744: 740: 732: 718: 712: 700: 697: 672: 669: 656: 651: 648: 643: 639: 631: 630: 629: 624: 617: 613: 609: 599: 585: 536: 513: 479: 476: 473: 469: 462: 450: 431: 430: 429: 415: 395: 387: 379: 376: 373: 365: 364: 363: 346: 340: 296: 291: 288: 285: 278: 277: 276: 274: 270: 255: 253: 249: 240: 236: 231: 227: 223: 220: 219: 218: 212: 208: 204: 201: 198: 194: 190: 187: 184: 180: 176: 172: 169: 166: 162: 158: 155: 154: 153: 151: 141: 139: 138: 133: 129: 125: 121: 117: 113: 109: 108: 103: 99: 97: 92: 88: 84: 80: 76: 72: 68: 64: 60: 56: 52: 48: 44: 40: 33: 19: 4077: 4025: 4014: 4003:. Retrieved 3994: 3963: 3954: 3943:. Retrieved 3930: 3911: 3905: 3881: 3801:Compton edge 3745: 3741: 3737: 3726: 3721: 3714: 3709: 3703: 3695: 3691: 3687: 3674: 3668: 3660: 3656: 3652: 3628: 3620: 3616: 3612: 3598: 3590: 3586: 3575: 3570: 3561: 3547: 3543: 3530: 3516: 3512: 3480: 3476: 3454: 3450: 3439: 3434: 3427: 3422: 3408: 3404: 3391: 3377: 3373: 3341: 3337: 3311: 3307: 3296: 3291: 3284: 3279: 3261: 3257: 3244: 3226: 3222: 3186: 3182: 3160: 3156: 3152: 3141: 3136: 3129: 3124: 3110: 3106: 3102: 3089: 3075: 3071: 3039: 3035: 2950: 2939: 2927: 2925: 2862: 2785: 2782: 2776: 2767: 2763: 2757: 2748: 2744: 2738: 2729: 2725: 2719: 2710: 2706: 2701: 2421: 2411: 2398: 2396: 2320: 2318: 2312: 2302: 2297: 2155: 2151: 2147: 2146: 2141: 2139: 2077: 2073: 2069: 2067: 1986: 1966:mass density 1960: 1956: 1954: 1849: 1845: 1841: 1839: 1824: 1820: 1816: 1812: 1808: 1804: 1800: 1796: 1794: 1783: 1779: 1777: 1773: 1351: 1343: 1339: 1332: 1328: 1326: 1311: 1287: 1274: 1269: 1019: 1012: 1008: 1004: 1002: 985: 983: 872: 868: 866: 834: 622: 615: 611: 607: 605: 496: 385: 383: 377: 372:radiant flux 361: 272: 268: 266: 245: 238: 234: 216: 210: 192: 182: 178: 164: 150:radiant flux 147: 135: 127: 123: 119: 115: 111: 105: 101: 95: 78: 46: 42: 38: 36: 3781:Attenuation 3587:transmitted 3544:transmitted 3513:transmitted 3477:transmitted 2399:non-uniform 2319:In case of 2160:exponential 1821:n σ dz 248:transparent 126:below. The 87:climatology 83:meteorology 61:, or other 4115:Radiometry 4104:Categories 4005:2015-03-15 3945:2015-11-03 3862:References 3266:absorbance 3191:absorbance 3161:black body 3111:black body 3076:black body 3040:black body 2076:, denoted 1338:, and the 1322:scattering 1318:absorption 1314:collimated 230:atmosphere 161:gamma rays 4120:Acoustics 3742:scattered 3692:scattered 3686:Radiance 3657:scattered 3617:scattered 3542:Radiance 3451:reflected 3405:reflected 3403:Radiance 3374:reflected 3338:reflected 3256:Radiance 3101:Radiance 3003:SI units 3000:Quantity 2839:σ 2826:⁡ 2798:ε 2655:ε 2634:∑ 2606:μ 2585:∑ 2559:μ 2523:σ 2502:∑ 2480:μ 2459:∑ 2439:μ 2397:Cases of 2377:ℓ 2368:μ 2364:− 2351:ℓ 2348:μ 2345:− 2255:μ 2249:ℓ 2240:∫ 2236:− 2206:μ 2201:ℓ 2192:∫ 2188:− 2116:⁡ 2109:μ 2095:μ 2024:− 1929:ρ 1917:μ 1899:ρ 1887:μ 1869:ρ 1865:μ 1750:λ 1744:Ω 1732:μ 1723:λ 1717:Ω 1705:μ 1692:λ 1686:Ω 1682:μ 1669:ν 1663:Ω 1651:μ 1642:ν 1636:Ω 1624:μ 1611:ν 1605:Ω 1601:μ 1588:Ω 1576:μ 1567:Ω 1555:μ 1542:Ω 1538:μ 1525:λ 1513:μ 1504:λ 1492:μ 1479:λ 1475:μ 1462:ν 1450:μ 1441:ν 1429:μ 1416:ν 1412:μ 1393:μ 1378:μ 1367:μ 1233:λ 1227:Ω 1199:λ 1193:Ω 1172:− 1160:λ 1154:Ω 1150:μ 1124:ν 1118:Ω 1090:ν 1084:Ω 1063:− 1051:ν 1045:Ω 1041:μ 951:Ω 923:Ω 902:− 894:Ω 890:μ 802:λ 790:Φ 774:λ 762:Φ 753:− 745:λ 741:μ 701:ν 689:Φ 673:ν 661:Φ 652:− 644:ν 640:μ 558:Φ 506:Φ 477:μ 474:− 455:Φ 440:Φ 323:Φ 301:Φ 292:− 286:μ 203:acoustics 59:particles 4022:(1960). 3755:See also 3738:absorbed 3688:absorbed 3653:absorbed 3613:absorbed 3308:absorbed 3258:absorbed 3223:absorbed 3183:absorbed 2416:and the 1993:decibels 1977:Decibels 993:radiance 226:infrared 199:⋅cm⋅MHz; 171:neutrons 144:Overview 98:-folding 3591:surface 3548:surface 3517:surface 3481:surface 3455:surface 3409:surface 3378:surface 3342:surface 3312:surface 3262:surface 3227:surface 3187:surface 3157:surface 3153:emitted 3107:surface 3103:emitted 3072:surface 3036:surface 2933:is the 2771:is the 2752:is the 2733:is the 2420:of its 2321:uniform 2305:is the 2162:in the 1983:decibel 1964:is the 1293:is the 1280:is the 991:is the 854:is the 843:is the 549:=0 and 370:is the 252:opacity 71:SI unit 4038:  3918:  3746:volume 3696:volume 3661:volume 3621:volume 3006:Notes 2926:where 2702:where 2298:where 1955:where 1848:, and 1813:n A dz 1801:σ 1270:where 984:where 835:where 497:where 408:=0 to 362:where 237:= cos 157:X-rays 134:. The 67:matter 63:energy 4074:IUPAC 3878:IUPAC 3744:by a 3694:by a 3659:by a 3619:by a 3589:by a 3546:by a 3515:by a 3479:by a 3453:by a 3407:by a 3376:by a 3340:by a 3310:by a 3260:by a 3225:by a 3185:by a 3155:by a 3105:by a 3011:Name 1784:total 1780:alone 1291:e,Ω,λ 1278:e,Ω,ν 222:solar 114:, or 77:(m). 55:sound 51:light 45:, or 4036:ISBN 3916:ISBN 3740:and 3690:and 3655:and 3615:and 3015:Sym. 2940:The 2068:The 1840:The 1327:The 1320:and 1018:and 1007:and 1003:The 867:The 621:and 610:and 606:The 428:as: 267:The 224:and 173:and 102:e.g. 85:and 37:The 4088:doi 4086:". 4032:355 3999:ISO 3892:doi 3890:". 3565:Ω,ν 3318:". 3268:". 3233:". 3193:". 2154:or 2072:or 1991:of 1023:Ω,λ 1016:Ω,ν 989:e,Ω 852:e,λ 841:e,ν 159:or 65:or 4106:: 4076:, 4034:. 3997:. 3993:. 3972:^ 3938:. 3880:, 3870:^ 3733:m 3725:Ω, 3713:Ω, 3683:m 3648:m 3608:m 3582:— 3574:Ω, 3539:— 3508:— 3472:— 3446:— 3438:Ω, 3426:Ω, 3400:— 3369:— 3333:— 3303:— 3295:Ω, 3283:Ω, 3253:— 3218:— 3178:— 3148:— 3140:Ω, 3128:Ω, 3098:— 3067:— 3031:— 2959:. 2937:. 2830:10 2823:ln 2610:10 2563:10 2372:10 2360:10 2259:10 2232:10 2119:10 2113:ln 2099:10 2081:10 2041:10 2020:10 1968:. 1844:, 1809:dz 995:. 598:. 197:dB 57:, 53:, 41:, 4090:: 4044:. 4008:. 3948:. 3924:. 3894:: 3727:λ 3722:μ 3715:ν 3710:μ 3678:Ω 3675:μ 3643:λ 3641:μ 3636:ν 3634:μ 3604:μ 3576:λ 3571:T 3562:T 3534:Ω 3531:T 3503:λ 3501:T 3496:ν 3494:T 3468:T 3440:λ 3435:R 3428:ν 3423:R 3395:Ω 3392:R 3364:λ 3362:R 3357:ν 3355:R 3329:R 3297:λ 3292:A 3285:ν 3280:A 3248:Ω 3245:A 3213:λ 3211:A 3206:ν 3204:A 3174:A 3142:λ 3137:ε 3130:ν 3125:ε 3093:Ω 3090:ε 3062:λ 3060:ε 3055:ν 3053:ε 3027:ε 2989:e 2982:t 2975:v 2931:A 2928:N 2911:, 2904:A 2900:N 2894:i 2890:n 2884:= 2879:i 2875:c 2848:, 2843:i 2817:A 2813:N 2807:= 2802:i 2777:i 2768:i 2764:c 2758:i 2749:i 2745:ε 2739:i 2730:i 2726:n 2720:i 2711:i 2707:σ 2683:, 2680:) 2677:z 2674:( 2669:i 2665:c 2659:i 2649:N 2644:1 2641:= 2638:i 2630:= 2627:) 2624:z 2621:( 2616:i 2613:, 2600:N 2595:1 2592:= 2589:i 2581:= 2574:) 2571:z 2568:( 2551:, 2548:) 2545:z 2542:( 2537:i 2533:n 2527:i 2517:N 2512:1 2509:= 2506:i 2498:= 2495:) 2492:z 2489:( 2484:i 2474:N 2469:1 2466:= 2463:i 2455:= 2448:) 2445:z 2442:( 2422:N 2382:. 2356:= 2341:e 2337:= 2334:T 2313:ℓ 2303:T 2283:, 2278:z 2274:d 2270:) 2267:z 2264:( 2244:0 2228:= 2223:z 2219:d 2215:) 2212:z 2209:( 2196:0 2184:e 2180:= 2177:T 2148:μ 2142:e 2125:. 2104:= 2078:μ 2049:. 2044:) 2037:/ 2033:B 2030:d 2027:( 2014:o 2010:I 2006:= 2003:I 1961:m 1957:ρ 1940:, 1933:m 1922:s 1910:, 1903:m 1892:a 1880:, 1873:m 1805:A 1797:n 1755:. 1747:, 1741:, 1737:s 1728:+ 1720:, 1714:, 1710:a 1701:= 1689:, 1674:, 1666:, 1660:, 1656:s 1647:+ 1639:, 1633:, 1629:a 1620:= 1608:, 1593:, 1585:, 1581:s 1572:+ 1564:, 1560:a 1551:= 1530:, 1522:, 1518:s 1509:+ 1501:, 1497:a 1488:= 1467:, 1459:, 1455:s 1446:+ 1438:, 1434:a 1425:= 1404:, 1398:s 1389:+ 1383:a 1374:= 1347:s 1344:μ 1336:a 1333:μ 1297:. 1288:L 1284:; 1275:L 1251:, 1245:z 1241:d 1230:, 1224:, 1220:e 1215:L 1210:d 1196:, 1190:, 1186:e 1181:L 1177:1 1169:= 1157:, 1142:, 1136:z 1132:d 1121:, 1115:, 1111:e 1106:L 1101:d 1087:, 1081:, 1077:e 1072:L 1068:1 1060:= 1048:, 1020:μ 1013:μ 986:L 969:, 963:z 959:d 948:, 944:e 939:L 934:d 920:, 916:e 911:L 907:1 899:= 876:Ω 873:μ 858:. 850:Φ 847:; 839:Φ 820:, 814:z 810:d 799:, 795:e 785:d 771:, 767:e 758:1 750:= 719:, 713:z 709:d 698:, 694:e 684:d 670:, 666:e 657:1 649:= 626:λ 623:μ 619:ν 616:μ 586:z 563:e 537:z 514:0 511:e 480:z 470:e 463:0 460:e 451:= 445:e 416:z 396:z 386:z 378:z 374:; 368:e 366:Φ 347:, 341:z 337:d 328:e 318:d 306:e 297:1 289:= 273:μ 239:θ 235:μ 211:α 193:α 183:Σ 165:μ 120:e 116:e 112:e 107:e 96:e 34:. 20:)

Index

Absorption coefficient
Attenuation constant
light
sound
particles
energy
matter
SI unit
reciprocal metre
meteorology
climatology
exponential decay
e-folding
e
radiation shielding
mass attenuation coefficient
radiant flux
X-rays
gamma rays
neutrons
nuclear reactors
ultrasound attenuation
dB
acoustics
particle size distribution
solar
infrared
atmosphere
transparent
opacity

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