!!! Due exctra thin film of mika SBT10A possible to detect Alpha! This product may also be called: SBT-10A, SBT 10A, sbt-10a, sbt 10a, sbt10a. Details: The SBT-10A is a Geiger-Muller tube containing 10 separated detectors, and a huge thin film mica window which allows detection of α, β (hard and soft) and γ radiation. Basically it for soft beta radiation by datasheet. The STB-10A tube is designed to be operated in various PROFESSIONAL radiometric devices. It has very HIGH SENSITIVITY (efficiency of registration) in comparison to other counters. Designed for registration of beta radiation with energy from 0.156 MeV GENERAL SPECIFICATIONS: Voltage of start of counting: 260-320V Operating Current each section: 0.3-1.5mkA Recommended Operating Voltage: 390 Plateau Length / Inclination: 80V / 0.3% / V Sensitivity from Cs137: 332.5-402.3 Pulses/mkR at Source = 4mkR/s Pulse amplitude - 5V Resistance of base = 10(in step 10)Ohm Beta radiation detection efficiency - 35% Own Background (Pulses / s): 2.17 at T=55+-3C Working range (mkR / s): 0.003 - 20 Dimensions: 88mm, 68mm, 38mm