A Sensitive Geiger-Mueller Detector Reading Flux and Dose Rate Directly

The development of an efficient gamma radiation detector that reads directly in flux and dose rate has been partially successful. The efficiency of the normal Geiger-Mueller counter is known to fall to a minimum in the region where high efficiency is most often needed, namely in the middle of the Compton scatter region. The interaction probability rises on the low-energy side, due to increasing photoelectric absorption, and on the high-energy side, due to increasing pair production. In the present work, the response to photo-electric and Compton electrons has been increased substantially by using a mesh cathode instead of a solid-walled cathode, together with an appropriate gas filling and an enlarged anode. Characteristics are adjusted bv use of a sliding sleeve.