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The lower cover (2) of the body (Figure 2) contains the battery compartment (7)
with two batteries and the detector of gamma and beta radiation (9), which consists
of four Geiger-Muller counters СБМ-20-1. The counters are fixed to the lower cover
and closed from the inside of the body with the metal energy compensated screen,
fixed with two screws. From the outside the detector is closed with a transparent for
beta particles polyethylene theraphthalate film and a metal beta-filter cover (10)
fixed with an original screw. Beta-filter cover is removed when beta-particles flux
density is measured.
The battery compartment is closed with a cover (8), fixed with the original screw.
The polarity signs are indicated at the bottom of the battery compartment for proper
insertion of batteries.
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