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Because of the complexity with which neutrons interact with the environment, precise determination of the neutron energy is quite difficult. Bonner sphere spectroscopy (BSS) is one of the few methods that provide an accurate measure of the
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embedded in moderating spheres of different sizes. Comparison of the neutrons detected by each sphere allows accurate determination of the
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Esposito, A.; Nandy, M. (2004). "Measurement and unfolding of neutron spectra using Bonner spheres".
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Bramblett, Richard L.; Ewing, Ronald I.; Bonner, T.W. (1960). "A new type of neutron spectrometer".
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A single Bonner sphere of an appropriate size can be used for
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