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Monte Carlo calculations of doses to tiles irradiated by 60Co and 252Cf simulating atomic bomb gamma-ray fluences.

Dose calculations for tiles exposed to the Hiroshima atomic bomb radiations were undertaken. A Monte Carlo code, ABOMB, was developed which considers the characteristics of atomic bomb gamma-ray fluences and geometrical configurations. ABOMB was applied to tile dose calculations for the available photon sources with definite fluences. Its validity was tested by comparing the depth-dose curves calculated for 60Co and 252Cf beams with the equivalent experimental data obtained in the laboratory. Selection of parameters, contribution of backscattering, and computing time also were considered. Present calculations are considered to be accurate with uncertainties less than +/- 10%, and may be useful for correcting or reinforcing atomic bomb gamma-ray doses, together with tile dose measurements by thermoluminescent (TL) dosimetry.