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LB-2 Low Background α/β The measuring instrument is mainly used for the low level total of various substances α、 total β An accurate measurement of specific activity of radioactivity. Used for environmental protection, detecting radioactivity in water, air, soil, and buildings; Used for health and epidemic prevention, and for detecting radioactivity in drinking water, food, vegetables, milk, and dairy products; Used for inspection of building materials, radioactive inspection of granite, marble, sand, cinder brick, slag brick, etc; Used for monitoring emissions, atmosphere, and environment from nuclear power and other nuclear facilities; Other applications include radiation protection, health physics, biomedical research, agronomy, archaeology, and geology.


Technical indicators


1. There are two independent low background αβ The main detector can simultaneously measure two samples, giving the total of the two samples α、 total β Activity concentration measurement is characterized by high sensitivity, low background, simple structure, convenient, stable, and reliable operation.


two β Source (active region Φ When the 2 π detection efficiency ratio of 20mm is ≥ 60%, the background count rate per unit area is ≤ 0.10cm-2min-1.

three α Source (active region Φ When the 2 π efficiency ratio is ≥ 85%,

Background count rate per unit area ≤ 0.002cm-2min-1.

4. String ratio: α get into β Channel ≤ 1%, β get into α Trace ≤ 0.1%.

5. Efficiency stability: α＜ 2%， β＜ 3%。

6. Instrument sensitivity: α= five × 10-4Bq； β= one × 10-3Bq。

7. Repeatability: When the instrument is continuously powered on for 24 hours, the efficiency of each detector changes by<± 5%.

8. Insulation resistance ≥ 2M Ω, withstand voltage insulation degree ＞ 1500V.

9. The ambient temperature for use is 5-40 ℃, and the relative humidity is<90%.

10. Power supply: AC 220V ± 10%, 50HZ, power consumption ≤ 20W. http://unifitpv.cn