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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.
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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.
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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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