Small Mica Window Geiger-Müller Counter for Measurements of Radioactive Isotopes <i>in Vivo</i>

Abstract

A small Geiger-Müller counter model constructed for the purpose of studying in vivo the metabolism of beta-particle isotopes in normal and pathological tissues is described. A ballast bulb was added to the small Geiger counters, thus increasing the volume of argon-alcohol mixture which appears to prolong the life of the counter.