GEIGER-MULLER COUNTER AND RADIATION DETECTOR

PROBLEM TO BE SOLVED: To provide a Geiger-Muller counter in which disturbance of an electric field is prevented and a radiation detector.SOLUTION: A Geiger-Muller counter (100) includes: a cylindrical sealed tube (110) formed of glass and having a space with two hermetically sealed ends ; a rod-like part (121) arranged in a space (114); a first linear metal lead part(122) connected to the rod-like part; an anode electrode (120) wherein the first metal lead part is supported by one end of the sealed tube; an annular part (131) surrounding the periphery of the anode electrode in the space; a second linear metal lead part (132) connected to the annular part; a cathode electrode (130) wherein the second metal lead part is supported by the other end of the sealed tube; and an inert gas and a quench gas hermetically sealed in the space.