The Detection of Ca45, I131, P32, and Zn65 by Photographic Film

Abstract
The density response of photographic emulsions to the radiations of Ca45, I131, P32 and Zn65 has been determined. Characteristic curves for all four isotopes against Eastman no‐screen x‐ray film and Eastman type M stripping film are presented, together with certain additional studies on Eastman NTB stripping film and Eastman type K x‐ray film. The relative photographic effectiveness of the isotopes examined increases in the order: Zn65, P32, I131, Ca45, C14. Applications of the data for quantitative radioautography are discussed.