Abstract

The validity of the photographic reciprocity law for alpha-rays has been confirmed for a ratio of source intensities of 171 to 1. The law had previously been confirmed for a ratio of source intensities of only 7 to 1. The source intensities used were equivalent to 1.38 millicuries/cm2 and 8.06×10−3 millicurie/cm2. The reciprocity law is found to hold for this ratio of source intensities when the exposures are made in a sequence which eliminates the effect of latent image growth. To avoid complications due to aggregate recoil the sources were coated with a layer of silver approximately 0.1μ in thickness.

© 1936 Optical Society of America

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