Gamma-Ray Exposure Measurements in a Man Phantom related to Personnel Film Dosimetry

Abstract

The variation of exposure with depth in a man phantom, together with the performance of film dosemeters on the surface, has been determined for uncollimated photons of energies from 48 keV to 28 MeV. To simulate radiation exposure conditions in the atomic energy industry, measurements were made with the phantom both stationary and rotating. The front to back attenuation factor for the static phantom of thickness 218 cm varied from 06 to 007 for photons of energies from 28 MeV to 48 48 keV in general agreement with published radiotherapy data. The measurements enable an improved estimate of the dose to an organ in the body to be made from a film dosemeter reading, provided that an indication of both the energy and direction of the incident radiation is available.