Description. Shipping. The SBM-20 is a reliable compact Geiger-Muller tube produced in the USSR in large quantities in decades past. It gives about 10-30 CPM (counts per minute) background radiation in most environments. It replaces for the earlier STS-5 tube, with improved performance and durability. The tube will come padded but without a box.
The SBM-20 tube is primarily sensitive to beta and gamma radiation and has a relatively low threshold for detecting radiation. It operates at a recommended voltage of around 400-500 volts. The SBM-20 tube is known for its compact size and ease of use, making it popular among hobbyists, educators, and professionals alike.
The lid has lead sheet under it held in place with aluminum tape. The array will peg a CDV-700 on the 100x scale if you open the box and set a piece of Fiestaware on the tubes. The plastic box bottom, perf board and metal SBM-20 tube block alphas and most betas from the bottom, so you can point the array at your suspected hot spot.
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