Abstract
This article describes a slide rule which makes it possible to determine the exposure time quickly and with sufficient accuracy when inspecting steel parts using Cs-137 and Ir-192 as radioactive sources and x-ray films of types RT-1, RM-1, RT-5, etc. The slide rule scales were designed on the basis of experimental data regarding absorption of gamma rays in steel. The slide rule is similar in construction to a normal doublesided slide rule with one slide and a cursor. Gamma-ray flow detection is one of the most common methods of identifying defects using radiation. The films of different components shot by different operators using the slide rule for determining exposure time can be simultaneously developed without visually controlling the photographic density.
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