SBM-20-1

Geiger-Muller counter SBM20-1 ionizing radiation sensors are intended for use in household radiation monitoring devices. They have low supply voltage, high speed and excellent output signal parameters. The case is made of stainless steel with a thickness of 50 microns. Geiger counters respond to hard beta and gamma radiation.

SBM-20-1 is the most popular counter among household dosimeters; it is a modernized version of the Geiger-Muller counter SBM-20.

SBM-20-1 is equivalent to SBM-20, STS-5, SI22G

Technical specifications:

• Recommended operating voltage: 400V
• Operating voltage range: 350V – 475V
• Counting voltage: 260V – 320V
• Pulse sensitivity to gamma radiation normalized by Cs-137 source: 60 ÷ 75 pulse/μR
• Dose rate range of recorded gamma radiation: 4∙10² – 40 µR∙s-1
• Maximum permissible current: 20µA
• Tube inductance: 4.2pF
• Work resource: 2 x 10¹⁰imp
• Recommended anode resistor: 5.1Mohm
• Operating temperature range : – 60°C to + 70°C
• Own counter background, no more: 1imp/s
• Dead time at U = 400V : 190µs
• Filling: Ne – Br2 – Ar
• Overall dimensions, height x width x thickness, no more: 107 x 11 x 11 mm
• Weight, no more: 10g