The LB-2 low background alpha/beta measuring instrument is mainly used for accurate measurement of low-level total alpha and total beta radioactivity of various substances. Used for environmental protection, detecting radioactivity in water, air, soil, and buildings; Used for hygiene and epidemic prevention, detecting radioactivity in drinking water, food, vegetables, dairy products, and dairy products; Used for building material inspection, including radioactive testing of granite, marble, sandstone, coal slag bricks, slag bricks, etc; Used for monitoring the emissions, atmosphere, and environment of nuclear power and other nuclear facilities; Other applications include radiation protection, health physics, biomedical research, agriculture, archaeology, geology, etc.

TECHNICAL INDEX

1. There are two independent low background alpha beta main detectors that can simultaneously measure two samples and provide measurements of total alpha and total beta activity concentrations in each sample. They have the characteristics of high sensitivity, low background, simple structure, easy operation, stability, and reliability.

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

When the 2 π efficiency ratio of the alpha source (active region Φ 30mm) is ≥ 85%,

The background count rate per unit area is ≤ 0.002cm-2min-1.

4. Cross channel ratio: α entering β channel ≤ 1%, β entering α channel ≤ 0.1%.

5. Efficiency stability: α<2%, β<3%.

6. Instrument sensitivity: α=5 × 10-4Bq; β=1 × 10-3Bq.

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

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

9. The operating environment temperature is 5-40 ℃, and the relative humidity is less than 90%.

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

Instrument configuration

1. One cabinet

2. One measuring instrument host

3. One set of lead chamber

4. Two main probes

5 anti coincidence probes, 2 pieces

6. Two HND Br scintillators

7. One piece of anti compliant plastic scintillator

8. 241Am standard substance 1 bottle

9. One bottle of KCL standard substance

10. 40 sample trays

11. Two lead block handles

12. One cross screwdriver

13. Four high-voltage cables

14. Four low-voltage cables

15. Four signal cables

16. One communication cable

17. One power cord

18. One USB drive

19. One copy of the user manual

20. One copy of the program operation manual

21. One copy of warranty certificate

22. One certificate of conformity

23. One computer

24. One LCD monitor

25. One printer

26. One copy of the legal measurement certificate

27. Responsible for technical support and training

The instrument has been strictly calibrated by the national metrology department and all performance indicators meet the requirements of Class II or above standards stipulated by the state.