The SPT-4000 low background multi-channel gamma spectrometer is a new intelligent nuclear measurement instrument suitable for measuring the radioactivity of building materials, minerals, and the environment. Widely used in quality and technical supervision, construction quality testing, building materials production enterprises, health and disease control, environmental monitoring, and teaching and research fields. The instrument has been inspected by the Institute of Metrology to ensure that its indicators fully comply with the "Code for Indoor Environmental Pollution Control of Civil Building Engineering" GB6566-2010, GB5101-2003, GB13545-2003, and GB50325-2010.

TECHNICAL INDEX

1. The working environment temperature is 0-40 ℃, and the working environment humidity is ≤ Rh90%

2. Measurable energy range: 20Kev~10Mev

3. Energy resolution: ≤ 7.0%（137C S）

4. Lead chamber measurement background ≤ 180CPM, stability: peak drift ≤ 1% (24h)

5. The total uncertainty of the instrument's measurement expansion shall not exceed 10% (K=2)

6. Analysis of nuclide types: 226Ra, 232Th, 40K 222Rn (expandable uranium-238, cesium-137, cobalt-60)

7. Using analysis software with a pure Chinese interface, mouse operation automatically models, calculates, and prints out reports, with print preview. The software supports two control modes: timed and fixed count, with timed alarm function, and can analyze track positions: 4096. The original report shows the calculation of internal and external irradiation index and measurement uncertainty.

8. Host connection mode: USB 2.0 HID (driver free connection), high voltage and gain digital adjustment, digital adjustable voltage regulator to reduce drift and improve stability and accuracy

9 instruments have obtained a patent certificate for extremely low static high voltage DC linear regulator (provide a copy of the certificate)

10. Fully automatic peak searching technology, with small errors and high recognition accuracy for all types of peaks.

Instrument configuration

1. One gamma spectrometer host

2. One set of high shielding lead chamber

3. One high-sensitivity detector (Japan Hamamatsu Photon)

4. A set of system operating software

5. 10 radioactive standard sample boxes (Φ 75 × 70ABS)

6. One user manual

7. One copy of the manufacturer's certificate of conformity and one copy of the packing list

8. One set of instrument connecting wires (3 in total)

9. One USB communication cable

10. One aluminum alloy suitcase

11. One instrument calibration certificate

12. One high manganese steel universal sample crusher (meeting the sample preparation requirements of the national standard GB6566)