Abstract
The angular dependence of the photographic response of a film badge, consisting of Ilford PMI film in combination with 1 mm thick filters of Al, Cd and Sn, exposed to 60Co 226Ra or 137Cs gamma-rays, were studied in detail. Photographic densities as functions of angles of incidence are examined for bare films and paper-wrapped films with filters in front of, behind, and on both sides of the film. The results are presented and an attempt made to explain them. The photographic densities of the parts of the paper-wrapped films covered by filters on both sides were found to be practically angular independent, irrespective of the radiations used.