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G17365 Glass Geiger Mueller Tube Russian made (CI-3BG) is designed to detect gamma rays. Size of tube including metal terminal end caps is only 2.2"L x 0.32" Dia. These operate from 380 to 460VDC. These are new-old stock and we test each one for proper operation. This fascinating tube was made for the Russian military and it allows you to make a compact geiger counter sensitive to gamma rays. See PDF of geiger counter below that you can make using readily available parts. G17365

