Tube: SBM-21 (СБМ-21) Miniature Geiger Muller
The SBM-21 Geiger tube offers relatively good sensitivity especially when compared to its ultra compact size.
Tube: STS-5 (СTC-5) Geiger tube
The STS-5 is a geiger tube for hard beta and gamma detection, manufactured in USSR in the 60's, similar in specs to the newer SBM-20.
Tube: SI-3BG (CИ-3БГ) Small Geiger Muller
SI-3BG Geiger tube is suitable for detecting high radiation doses, but finds little use in DIY applications.
Tube: SI-22G (CИ-22Г) Sensitive Geiger Muller
Pictures: Details: The SI-22G is a highly sensitive hard beta and gamma radiation detector tube,…