Abstract
All of the materials and instruments used in the fabrication of the counter were produced by East German industry (with the sole exception of the scintillation measuring probe). The shielding includes 50 tons of gypsum, and the measurements chamber is built from a section of iron ductwork (diameter 145 cm, length 200 cm, wall thickness 1.5 cm) fabricated in 1925. The measurement chamber is lined with lead plates 6 mm thick and 150 cm long, thinning out the background in the low-energy portion of the spectr~ (down to 500 keV). The lead, a product about half a century old, was studied for its own content of radioactive materials before being set in place in the measurement chamber. The lead plates were coated with electrolytic copper sheet of 3 mm thickness to absorb the characteristic K-radiation. The earlier Tl-activated NaI crystal (diameter 100 ram, height 70 mm) scintillation measurement probe [1] was later replaced with a new Nuclear Enterprises measuring probe. The latter featured
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