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Bonner sphere

Bonner spheres are used to determine the energy spectra of a neutron beam The methodology was first described Rice University's Bramblett Ewing and Bonner in 1960 and employs five sizes of spheres which were calibrated provides a basis for accurate neutron energy determination The diameter of the spheres are carefully selected and contain a centrally located themal neturon detector Because of the complexity with which neturons interact with the environment precise determination of the neutron energy is quite difficult Bonner sphere spectrocopy (BSS) is one of the few methods that provide an accurate measure of the neutron spectra
___ Bramblett RL; Ewing RI; Bonner TW "A New Type of Neturon Spectrometer" Nuclear Instruments & Methods; Vol: 9, Oct 1, 1960