The SI-39G Geiger tube is a very good all-purpose tube made to detect both Beta and Gamma radiation. Similar in construction to the SI-10BG, SI-11BG, SI-BG, and SI-22BG, the SI-39G has a slightly longer internal cathode sleeve to enhance its sensitivity. It was designed to snap into ¼” fuse holder-type clips in one of the many specialized military Geiger counters used during the Cold War period. https://www.youtube.com/watch?v=82g8bY2YEFw
SI-39BG
$37.95Price
