Abstract
The number photon spectra of transmitted cobalt-60 gamma-rays scattered by thick concrete barriers were determined as functions of the angle of scatter and of the barrier thickness under broad incident beam conditions. The energy region for which the maximum number of photons occurs, shifts toward lower energies with increasing thickness, but the rate of this shift as a function of the thickness of concrete becomes small for thick slabs. When the number of photons is plotted as a function of barrier thickness, it is found that after an initial buildup an “equilibrium” thickness is approached. For greater thicknesses the slope of the curve plotted is a constant. The constants determined for plots corresponding to all angles of scattered radiation greater than 0° with the normal to the surface are equal to one another.
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