Figure 7.15: Lead shielding and activity probe LB 1238
Technical data:
Detector: Proportional end window counter tube
Entrance window: Mica window, about 2 mg/cm²
Energy range: Alpha: from 3 MeV
Beta: from 40 keV
Responsiveness: Am-241 approx. 18%
Sr-90 approx. 46%
Protective grid: Covers approx. 30%
Background: Alpha channel: typ. 0.75 counts/min
Beta channel: typ. 13 counts/min
Measuring range: Background up to 33 000 cps
Operating voltage: typ. 1350 V
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