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The low background alpha / beta detector is a precision instrument for measuring low level alpha and beta radioactivity. It can be used to measure the total alpha and total beta radioactivity of water, soil, building materials, minerals, aerosols, food and so on; the detection of alpha / beta radioactivity in radiation protection and environmental protection; and radioactivity monitoring in scientific research, medical, biological and agricultural fields.
The LB series gas flow meter is stable in performance, compact in design and easy to operate. With modular design, the maximum can be increased to eight detectors according to user needs. In order to reduce the radiation of the surrounding environment and the interference of the cosmic ray to the measurement, the specific counter tube is used as the detector, and the specially designed screen count tube is used to counter the counter tube. The thick lead chamber was shielded from external radiation with selected "old lead". Therefore, the instrument has high sensitivity and low background. The detection efficiency of the low energy 14C beta source is more than 38% (2 pi).
Main performance indicators
1. Bottom counting rate
Alpha < < 0.0017cm-2min-1; beta < < 0.025cm-2min-1
2. Detection efficiency
Alpha source: 239Pu > 78%; beta source: 90Sr-90Y > 50%; 14C > 38%.
Alpha to beta < 1% (210Po source); beta pair alpha < 0.1% (90Sr-90Y source).
4, power supply: 220VAC 50HZ power less than 250VA