Russian Geiger Counter SBM-20 Lot of 10 NEW

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Russian Geiger TUBE Counter SBM-20

Lot of 10

New old stock.

GENERAL SPECIFICATIONS

Parameters	SBM-20 / SBM-20U
Gas Filling	Ne + Br2 + Ar
Cathode Material	Stainless Steel, 50 mkm
Maximum Length (mm)	108 / 101
Effective Length (mm)	91.0 / 83.5
Maximum Diameter (mm)	11
Effective Diameter (mm)	10
Connector	Pin
Operating Temperature Range ⁰C	-60 to +70

ELECTRICAL SPECIFICATIONS

Parameters	SBM-20 / SBM-20U
Minimum Anode Resistor (meg ohm)	1.0
Recommended Anode Resistor (meg ohm)	5.1
Recommended Operating Voltage (volts)	400
Operating Voltage Range (volts)	350 - 475
Initial voltage (volts)	260 - 320
Plateau length (volts)	at least 100
Maximum Plateau Slope (%/100 volts)	10
Minimum Dead Time (at U=400V, micro sec)	190
Working range (mkR/s)	0.004 - 40
Working range (mR/h)	0.014 - 144
Gamma Sensitivity Ra²²⁶ (cps/mR/hr)	29
Gamma Sensitivity Co⁶⁰ (cps/mR/hr)	22
Inherent counter background (cps)	1
Tube Capacitance (pf)	4.2
Life (pulses)	*at least 210¹⁰**
Weight (grams)	10 / 9

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