Tube: G21-H Geiger Muller

Pictures:

Details:
Halogen quenched Geiger Muller Tube, for gamma ray counters, manufactured around 1968 at I.F.A. Romania (Institute of Atomic Physics, Bucuresti, Romania).
It uses 400V, background radiation 110impulses/minute, at the life is guaranteed for 10^9 impulses.
Datasheet:

Links:
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