You searched for: “electronic logger
electronic logger; Geiger-Mueller probe, Geiger probe
A Geiger-Mueller is a counter in a watertight container, which is lowered into a borehole to log the intensity of the gamma rays produced by radioactive substances in traversed rock or across a thin section of stone.
This entry is located in the following units: electro-, electr-, electri- (page 65) -tron, -tronic, -tronics + (page 10)