THEORY OF ALPHA-RAY COUNTING FROM SOLID SOURCES

Abstract

The theory of alpha-ray counting from thin sources of atomic dimensions, from layers whose equivalent thickness is less than the range of the particle, and from thick sources is developed, assuming uniform collection over the surface such as obtained in parallel-plate collection chambers, with and without absorbers. For alpha-ray counting from rocks which normally contain 25 alpha-ray emitters, resultant equations and curves are given which can be used directly in computing actual emission from observed count. A test of the theory by experimental results on granite is given.