The energy loss spectra for gamma rays in NaI and CsI crystals have been calculated by the Monte Carlo me¬thod. The calculations have been carried out for point sources, broad and collimated parallel beams, and disc sources of mono-energetic gamma rays varying in energy from 0.142 to 14.0 Mev. The crystals considered were right circular cylinders, varying from small crystals of height and diameter of 0.5 inch to large crystals of height 12 inches and diameter 9 inches, and in addition for a sphere of 1-inch radius. Also calculated simultaneously with the energy loss spectra were the efficiencies and total absorption fractions. This report also includes results which were reported by the authors in the Review of Scientific Instruments, 31, 39 (1960) and 31, 861 (1960).
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