The SPT-6000 series multi-channel 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.

Sensor:

1. Use anti coincidence nuclear electronics system to remove natural radiation background interference. The anti coincidence sensor crystal is the EJ200 plastic scintillator from Eljen Technology in the United States.

2. The sensor uses triphenylene and zinc sulfide (silver) as luminescent materials, and is manufactured using multiple hot pressing techniques. The product is stable, reliable, moisture resistant, and can be wiped.

controller:

1. Adopting extremely low static current high-voltage DC linear regulator technology to achieve multi-channel adjustable output of a single high-voltage generator. Improve high voltage stability, reduce ripple, and achieve the industry's lowest overall power consumption of less than 12 watts.

2. Introducing CPLD (Programmable Logic Device) technology for the first time into low background alpha/beta measuring instrument products. CPLD devices have high speed, high reliability (typical device output delay less than 10 nanoseconds), and extremely low power consumption. Replacing traditional discrete digital systems with CPLD devices greatly improves product integration and reliability.

3. Adopting the USB 2.0 standard driver free connection method with excellent universality, it can be applied to any form of computer.

4. Both high voltage and threshold are adjusted digitally through computer software using numerical control mode. Compared to the general potentiometer adjustment high voltage mode, the digital adjustment method is easy to operate and store, digitized, recoverable, and has excellent reproducibility. The parameter data is stored in the host FLASH Memory, which can completely prevent data loss caused by computer failures.

5. The controller adopts a 2.4-inch, 320 * 240 resolution, 24 bit color depth, TFT true color LCD interactive mode. Compared to traditional display modes such as digital tubes, LCD displays can provide more detailed output information, are programmable, display clearly, have lower power consumption, and are stable and reliable.

6. Standard 2U height 19 inch chassis.

7. All products can be upgraded up to the highest 8-channel mode.

Analysis and collection software:

1. Designed using the standard WINDOWS multi document program mode, it has good compatibility with the operating system and runs stably and reliably. Multiple sets of data can be measured, analyzed, and printed simultaneously. Running in multi-threaded mode with high efficiency. Can print test reports and support print preview. Can be matched with any

The data collection and processing of the system, as well as the control of the measurement process, are all completed by the computer model.

3. The measurement time, alpha threshold (α), beta low threshold (β L), beta high threshold (β H), and anti coincidence threshold of each detector can be adjusted by computer according to requirements.

4. High performance anti coincidence electronics, microcomputer control, setting working points, checking background counting, calibration efficiency (combined with standard sources); Automatically provide table format results, automatically deduct background, and directly obtain the specific activity of the sample (Bg/L, Bg/Kg, Bg/m3).

5. Multi channel independent operation, independent timing measurement, can send samples at any time, greatly improving the efficiency of equipment use.

6. Alpha and beta can be measured simultaneously, or alpha or beta can be measured separately.

7. Measurable: Various samples such as water samples, soil samples, oil samples, contaminated wiping (peeling) samples, aerosol samples, etc.

8. The equipment that can be equipped with this instrument includes water sample preparation equipment, air sampling equipment, and contaminated sample ashing equipment.

Mechanical structure and shielding:

1. Full lead structure lead chamber, using multi-layer composite shielding, with low background and high sensitivity to detect extremely low levels of radioactivity.

2. Adopting a drawer type sample delivery mechanism, the structure is simple and the operation is convenient.

3. Adopting anti coincidence shielding technology, integrated 2 π shielding has been achieved, which can effectively shield cosmic rays.

4. Adopt standard 19 inch cabinets with protective doors.

5. Equipped with an extremely low center of gravity wheel set and heavy-duty horizontally adjustable hooves for easy movement.

Technical Specifications:

1. Working power supply: AC 220V ± 10%, 50Hz ± 1Hz;

2. Environmental temperature: (5-35) ℃;

3. Maximum humidity: ≤ 85% RH (30 ℃).

If the ambient temperature in the laboratory is too high, air conditioning equipment should be prepared; If the humidity is too high, dehumidification equipment should be prepared. This instrument is a low background equipment and should be placed in a laboratory away from reactors, accelerators, strong radiation sources, and large electromechanical equipment (such as large motors, refrigerators, etc.) in a clean environment. The 220V power supply in the laboratory should be connected to a good grounding wire.

When the 2 π detection efficiency of the instrument for 90Sr-90Y β source is ≥ 52% (efficiency ratio ≥ 58%), the β channel background is ≤ 0.10 counts • cm-2 • min-1;

When the 2 π detection efficiency of the instrument for 239Pu α source is ② ≥ 80% (efficiency ratio ≥ 88%), the count of α background is ≤ 0.003 • cm-2 • min-1;

7. α/β crossover performance: α entering β channel ≤ 2.5%, β entering α channel ≤ 0.3%;

8. Stability of alpha efficiency: When the instrument is continuously powered on for 24 hours, the efficiency change of each detector is less than ± 3%;

9. Stability of β efficiency: When the instrument is continuously powered on for 24 hours, the efficiency change of each detector is less than ± 8%;

10. Background stability: Within a 24-hour measurement time, the background count change should be within the range of (average count ± 3 σ), where σ is the standard error of the background count;

11. Sensor size: various specifications such as diameter 30mm, 45mm, 50mm, etc.