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Parameters and characteristics .
GM tube (counter)
Starting voltage = 280...330 V
Advised working voltage = 360...440 V
Plateau length = at least 80 V
Plateau slope = 0.125% / 1 V
Maximum natural background = 27 pulses / min
Load resistance = 5...10 MOhm
Allowable stray capacitance of input circuites = 10 pF
Transit capacitor = 7...10 pF
Allowable surround temperature -40 ... +50 OC
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