Large area multi-wire proportional counter

In the measurement of ionizing radiation, the measurement of alpha and beta radioactive planar sources is a very important part of the radioactive active measurement system. The surface emissivity of alpha and beta radioactive planar sources can be used as a radioactivity measurement standard for the calibration of instruments and the measurement of radioactivity in environmental samples after being measured as an activity reference source or a test source. The main measuring device for α and β radioactive plane sources is a large-area 2π multiwire proportional counter, which has a detection efficiency of nearly 100 percent for the measurement of α and β radioactive plane sources and is an absolute measurement method for 2π radioactive plane sources.

Technical features:

1. In order to reduce the measurement background and improve the measurement accuracy, the anti-coincidence technology is adopted.

2, integrated electronics circuit, instead of the traditional NIM plug-in, so that the system operation is more simple and reliable.

3. The special measurement software can set various measurement conditions and display the plateau curve, and the measurement results are clear at a glance.

4. Overall cabinet design, high system integration.

Main technical indicators

(1) Activity sample area: 1521cm ²;

(2) Multifilament chamber volume: 39cm (length) × 39cm (width) × 7cm (height);

(3) Pingping characteristics: 241Am source: Pingping is better than 1%/100V 90Sr-90Y source: Pingping is better than 2%/100V

(4) background count rate: α source is not more than 0.001cm-2 * S-1;β source is not more than 0.05 cm-2 * S-1

(5) Repeatability: better than 1%

(6) Surface emissivity: the relative deviation from the nominal value is within ± 2%

(7) Expanded uncertainty better than 1%(k = 2)

(8) Power supply: 220V 50Hz;

(9) Flow velocity: 0~200sccm;