The data are presented in the form of the number of photons at particular energies per event. The photon energy groups were chosen to correspond to the energies at which it vas most convenient to calculate the energy absorption buildup factors.nA considerable amount of work on the gamma rays resulting from in-elastically scattered neutrons is included here in some detail, in order to clarify the reasons for using the values tabulated here for this re¬action. It is recognized that the treatment of the subject given here is not exhaustive, and may be subject to revision when further experimental or theoretical information is available.
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