Radioactivity detection device

摘要

The present invention pertains to a radioactivity detection device which uses a radioactivity-light conversion medium, i.e., scintillators, and pertains in particular to a radioactivity detection device which is designed to enable effective detection of radioactivity over a wide surface area, and which is designed to immediately stop the supply of high-voltage to the photoelectric tube if the light-blocking film of the scintillators breaks, thereby preventing damage to the photoelectric tube. In the past, in order to prevent radioactivity from coming into contact with humans directly, and to prevent operators in nuclear power plants from being exposed, etc., three types of radioactivity detection devices have been used to detect radioactivity on personnel. First conventional detection devices in which scintillators are used are suitable for small surface areas, but they have been problematic. Secondly, with gas-flow-type radioactivity detection devices, which are used for detection on a large surface area, a large voltage is applied to a core wire and the surrounding area is filled with a counting gas. Thirdly, a number of devices have been proposed in which Geiger-Muller tubes are used. However, these are problematic because (alpha) rays cannot be measured. The present invention has been developed in order to eliminate the problems of the conventional technology described above.