Carbon Dioxide Filled Geiger-Müller Counters

Abstract

Efficient detection of the long period carbon isotope, C¹⁴, can be achieved when this isotope is oxidized to CO₂ gas which may then be used as a Geiger‐Müller counter filling. The special problems which arise in CO₂ counters are discussed. Carbon dioxide ions produce undesirable effects which are eliminated by small amounts of CS₂. The result of the investigation has been to develop a CO₂–CS₂ counter which has satisfactory properties for routine studies of C¹⁴.