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DOSIMETER GEIGER COUNTER DRMB1, 1970's
Measures down to point 01 of a Roentgen. The calibration source mounted in the cover has been removed for health and safety reasons.
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- It is Geiger counter, DR-M1 - Detektor radioloski - model 1 ( Radiological detector model 1). It uses two Geiger Muller tubes - Phillips 18504 for low range and Phillips 18529 for R/h range. It has two transistors - OC76 for driving high voltage transformer and OC72 as headphone amplifier. Also, it has two vacuum tubes CK5886, for amplifying Geiger tube current. Made by Rudi Cajavec in Banja Luka.
Uses Sr-90 check source (it has been in that black circle in the bag, you don't have it). Detects only beta and gamma radiation.
.......... Milos, Pozarevac, Serbia, 24th of November 2010