(Four channel) low background alpha and beta measuring instrument

1. It has a step-by-step sample delivery technology, which can simultaneously or separately measure the activity concentrations of total alpha and total beta in four samples, improving the flexibility of measurement and instrument efficiency.

2. The average background count rate per unit area is α ≤ 0.003 · cm-2 · min-1 and β ≤ 0.1 · cm-2 · min-1.

3. Efficiency ratio: α ≥ 85%, β ≥ 58%.

4. Efficiency stability: α<3%, β<8%.

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

6. Cross channel ratio: alpha rays for beta channels ≤ 2.5%, beta rays for alpha channels ≤ 0.3%.

★7. Both the main detector and the anti coincidence detector use plastic dual scintillators with washable surfaces. The appearance of the anti coincidence detector is square, which is suitable for reducing the instrument background. (Provide certified detector related certificates stamped with the manufacturer's seal).

★8. The control device has high-speed multi-channel parallel computing processing technology to achieve synchronous processing of multiple signals, with high integration and greatly improving instrument stability（Provide certified certificates related to control devices, stamped with the manufacturer's seal.

9.The measurement process adopts program-controlled high voltage setting, uses mainstream commercial computers, and is independently used for easy maintenance and replacement.★10. Operating system obtained national recognitionSoftware Copyright, applicable toWindows. XP system, independently developed and designed for easy later upgrade services, (providing software copyright certificate stamped with the manufacturer's seal).

11. Collection mode: Can resume collection at a breakpoint, meaning that the user can pause or resume collection at any time.

★12. Low background alpha and beta measuring instruments belong to mandatory testing instruments and involve nuclear safety issues related to drinking water for people's livelihoods. The instrument must also have a "Production License for Manufacturing Measuring Instruments" and a "Radiation Safety License"《Approval Certificate for Exemption Management of Radioactive Sources》The approval certificate for exemption management of radioactive sources is issued by the Ministry of Environmental Protection of ChinaThe list of valid "Certificate of Exemption from Filing for Radioactive Isotopes and Radiation Devices (First Batch)" published nationwide in 2016 shall prevail, stamped with the manufacturer's seal.

★13. The instrument must pass the Quality Management System Certification, Environmental Management System Certification, and Occupational Health and Safety Management System Certification, and provide relevant certificates stamped with the manufacturer's seal (the scope of certificate certification must include the instrument).

★14. Manufacturing enterprises have participated in the formulation of relevant national standards for radioactive testing (providing relevant national standard certificates).

★ 15. Manufacturing enterprises participate in the formulation of the national standard CJJ/T 182-2014 "Technical Specification for Urban Water Supply and Sewage Treatment Laboratory" (provide relevant national preparation certificates).

Product Configuration Checklist:

1. One network cabinet

2. One set of four channel control system

3. Four main detectors for plastic dual scintillators

4. Anti coincidence detector for plastic dual scintillators2only

5. One set of four channel lead chamber

6. 1 set of base with 4 pulleys

7. Standard powder source KCl 1bottle

8. Standard powder source 241Am 1bottle

9. Lead room handling handle 2 pieces

10. One machine foot wrench

1 11.12-inch screwdriver

12. 100 sample trays

13. One set of detector connecting wires

14. One USB data cable

15. One power cord

16. One set of operating system software for alpha and beta measuring instruments

17. One copy of the metrological verification certificate

18. One copy of the product user manual

19. One system CD

201 copy of product qualification certificate and 1 copy of packing list

21One copy each of the License for Manufacturing Measuring Instruments, Radiation Safety License, and Certificate of Exemption Management for Radioactive Sources.