1. Incoming sample requirements: the 2-way low background alpha beta measuring instrument must be equipped with two independent sample ejector plates, which are flexible in the sample manner, and provide the sample of the equipment to be taken in the sample to show the evidence.

There must be only one sample slot for each sample tray to place the sample tray.

The two incoming samples of the instrument can complete the total alpha beta measurement of the sample separately, and the measurement results can be printed separately from each sample.

4. While the instrument works on any of the incoming sample, it can still place the sample on another drawing board to start the measurement.

5. The measurement results can be saved automatically after the measurement of each channel of the instrument.

6. The instrument adopts the 1-10 road combination low background alpha beta measurement system, and the measurement channels can be extended to 10 road, and provide the software copyright certificate of the 1-10 combination low background alpha beta measurement system.

7. Data processing: the instrument program control system has the function of incoming sample at any time.

The counting rate of alpha particles in the unit area is less than 0.003 cm-2min-1;

9. The counting rate of the beta particles in the unit area is less than 0.15 cm-2min-1;

10, instrument for 239 pu alpha source (active area Φ 25 mm) of two PI detection efficiency more than 85% or higher;

11, instrument for 90 sr - 90 y beta source (20 mm) active area Φ 2 PI detection efficiency more than 55% or higher;

12. Repeatability: the instrument continuously measures 24 hours, and the detection efficiency changes alpha < 2% and beta < 3%;

13. Crosstalk ratio: alpha entered beta with a ratio of < 1% (to 239Pu),

14. Crosstalk ratio: the count of beta entering the alpha channel is less than < 0.3% (for 90sr-90y);

15. Pressure insulation degree > 1500V;

16, insulation resistance or 2 m Ω;

17. Instrument sensitivity: alpha: 1.6 x 10-2bq; Beta: 2.8 x 10-2 bq

18. Measurement method: the alpha beta can be measured at the same time, and alpha or beta can be measured separately; The measurement process and measurement results can be displayed on the monitor and can be printed. The measurement time, the alpha threshold of the detector, the beta low threshold (beta L), the beta high threshold (beta H), and the high pressure can be adjusted by computer according to the requirements.

19. Working conditions

1) power supply voltage: ac 220V plus or minus 10%; 50 hz.

2) ambient temperature: 5 ~ 400C plus or minus 20C;

3) relative humidity: < 90% (+ 300C).

20. The machine cabinet of the instrument and the computer are designed with the separation design (the computer is placed on the test platform to operate the instrument).

21. The instrument must be fitted with two anti-coincidence scintillator detectors to effectively reduce the base.