Low background alpha beta counter

The low background α/β detector is a precision instrument for measuring low level α and β radioactivity. It can be used for the measurement of total α and total β radioactivity in water, soil, building materials, ores, aerosols, food, etc.; α/β radioactivity detection in radiation protection and environmental protection; and radioactive monitoring in scientific research, medical treatment, biology, agriculture and other fields.

LB series flow gas type measuring instrument has stable performance, compact design and convenient operation. The modular design is adopted, and the gas circuit system is connected in parallel. Each path is completely independent and does not affect each other. Each path has an independent detector, equipped with 10 cm lead 4π shielding and electronics unit, which can be increased to 32 detectors according to user requirements. The large area thin window flow gas proportional counter tube is used as the detector, and the specially designed shielding counter tube is used to carry out anti-coincidence with the measuring counter tube to reduce the interference of ambient radioactivity and cosmic rays on the measurement. Use selected "old lead" to make thick lead room to shield external radiation. Therefore, the instrument has high detection sensitivity and low background. The detection efficiency of low energy 14Cβ source is ≥ 38%(2π).

main performance index

1. Background counting rate

α≤ 0.0017cm-2min-1;β≤ 0.025cm-2min-1

2. Detection efficiency

     α detection efficiency ≥ 55%(Po-210,Am241,Th-230),β detection efficiency ≥ 55%,(Sr-90/Y-90,Cs-137,Tc-99)  

3、Cross-channel ratio: cross-channel ratio: α enters β channel <0.1 (Am-241);β enters α channel <0.1 (Sr-90);                                              

4. Effective area of detector: ≥ φ60mm;

5. Power supply: 220VAC 50HZ power consumption ≤ 250VA

6. ping oblique: α ≤ 1.2%/100V, ping length> 200V;β≤ 2.5%/100V, ping length> 200V

7. Working temperature: 0-50 ℃;

8. Relative humidity: 10%-90%, non-condensing;

9. Applicable power supply: 220V AC(± 10%),50Hz(± 5%);