Geiger-Muller counter SI-1G (СИ-1Г). Star in the rhombus. Military acceptance

Description

Good condition. Operability not verified!!!  1969
There is an asterisk on the dosimeter case. This is the designation of the military acceptance of the quality of the USSR. Rarity. The passport also has a diamond stamp and the letters "ВП" in it. Over time, it disappears and becomes barely noticeable (last picture!)
Technical parameters
Geiger-Muller counter SI1G
This product can also be called: SI 1G, SI-1G, si1g, si 1g, si-1g.
SI1G Geiger-Muller counter is designed for registering gamma radiation.
Also on the site zapadpribor.com similar counters are presented.
Technical characteristics of SI1G:
Operating voltage - from 350 V to 450 V.
The length of the counting characteristic plateau is at least 80 V.
The counting start voltage is from 280 V to 335 V.
The slope of the counting characteristic plateau is 0.125 % / V.
Dosimetric characteristics OF products si1g counters:
- counting speed (N) at 0.1 µr / s - from 496 imp / min to 744 imp / min;
- counting speed-17 500 imp / min;
- maximum counting speed (Nmach) - 105 imp / min;
- natural background level (NF) - 25 imp / min;
- maximum dose rate (PMA), short - term-50 R/h.
The case is made of glass.
The cathode is a stainless steel tube.
Load resistance SI-1G - from 5 To 10 MOhm.
The largest parasitic capacity allowed in the input circuit is 10 pF.
The transient input capacity is from 7 pF to 15 pF.
Service life (number of pulses) - at least 109.
Ambient temperature - from -50° C to +70° C.
Overall dimensions:
- diameter-no more than 50 mm;
- length-no more than 90 mm.
Weight - no more than 15 g.
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