Main technical specifications

■ Multiple independent main detectors, can measure multiple samples at the same time, giving the total α, total β activity concentration measurements in the sample respectively;

■ Can be run under Windows, the operation process with Chinese prompts, automatic measurement program and print the results;

■ high pressure adjustment requirements: the instrument regulates the high pressure, measurement software by the computer program control of the main detector and anti-conformity detector high pressure threshold adjustment;

■ The main detector is composed of low-noise photomultiplier tubes and low background α, β scintillator, the surface can be scrubbed, scintillator area: ≥ 15.896cm2; 

■ Detector can measure α, β radioactivity at the same time, but also can be measured alone α or β;

■ The anti-compliance detector consists of a plastic scintillator and a photomultiplier tube, with an anti-compliance efficiency of >99%;

■ The instrument has a background of ≤0.15 cm-2min-1 for 90Sr- 90Y β sources with a 2π detection efficiency ratio of ≥52%; 

    For 239Pu α source, the background is ≤0.005cm-2min-1 when the 2π efficiency ratio is ≥82%;

    α / β cross performance: α into the β channel ≤ 3% (for 239Pu), β into the α channel ≤ 0.5% (for 90Sr-90Y);

■ Stability efficiency stability: the instrument is continuously energized for 24 hours, the efficiency of each channel detector changes within ± 3%;

■ background stability: in 100min of measurement time, the background count change should be within the range of (Nb ± 3σ);

■ sample-changing device and lead chamber: sample-changing device is made of stainless steel, the lead chamber is shielded by 7.5cm of lead and 1.5cm of round steel shell, and the two main detectors are installed in the same lead chamber.

■ Instrument sensitivity: α ≥ 5 × 10-5Bq; β ≥ 1 × 10-6Bq

■ Voltage withstand insulation degree>1500V; 

■ Insulation resistance ≥ 2MΩ;

■ Power supply voltage: AC 220V ± 10%, 50Hz;

■ Ambient temperature: 0 ~ 35 ℃ ± 2 ℃;

■ Relative humidity: <85% (+30℃).

■ Measurement process and measurement results can be displayed on the monitor and the results can be printed;

■ Measurement time, detector α-threshold, β-low threshold (βL), β-high threshold (βH) and high voltage can be adjusted by computer according to requirements.

Scope of application

■ Sample testing in research laboratories

■ Environmental monitoring departments

■ Nuclear emergency response

■ Defense and customs port sample testing

■ Radioactive environmental contamination monitoring

Standards

■ GB/T 20131-2006 “Calibration and use of alpha/beta flow gas type positive displacement counters 

■ GB/T 11682-2008 “Low background alpha and or beta measuring instrument”. 

■ JJG 853-2013 “Low background α and β measuring instrument calibration regulations”.

■ DB21/T 2900-2018 “Determination of total alpha radioactivity in solids, thick source method”. 

■ JJF 1762-2019 “Low background α, β measuring instrument type evaluation outline”.

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