Xenon source virtual point source scale device and method based on point source efficiency function

A calibration method and virtual point technology, applied in the field of radiation detection, can solve the problems of large calculation error, short service life, and failure to solve the virtual source position determination method, and achieve the effect of reducing work links and reducing source purchase costs.

Active Publication Date: 2015-04-01
NORTHWEST INST OF NUCLEAR TECH
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Problems solved by technology

[0003] Chinese invention patent 201310617130.5 a method and device for calibrating xenon sample HPGe detection efficiency and 201310294436.1 surface source automatic simulation calibration gas source detection efficiency method and device system, mainly using surface source calibration radioactive xenon gas source efficiency, the disadvantage of using surface source is Its diameter must be consistent with the diameter of the gas source to be simulated, and it can only simulate a fixed-shaped gas source such as a cylindrical gas source. At the same time, the uniformity requirements of the surface source are also high, and the production cost is high.
[0004] Chinese invention patent 201410264382.9 uses a meth

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  • Xenon source virtual point source scale device and method based on point source efficiency function
  • Xenon source virtual point source scale device and method based on point source efficiency function
  • Xenon source virtual point source scale device and method based on point source efficiency function

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Embodiment Construction

[0042] Basic principle of the present invention:

[0043] Virtual point source: For the radioactive gas source measured by the radiation detector, there is a unique representative point position on the central symmetry axis of the detector, and the detection efficiency of the point source at this position is equal to the efficiency of the radioactive gas source, that is, the point The source is called a virtual point source of a radioactive gas source.

[0044] Virtual source scaling process:

[0045] First, the standard mixed point source is placed at different positions on the symmetric center axis of the upper surface of the detector to obtain its detection efficiency, and the fitting function of the point source detection efficiency and its height when r=0 is obtained:

[0046] ε p (E γ ,r=0,h)=(a 3 h 2 +a 4 h+a 5 ) -1 (1)

[0047] In the formula, a 3 、a 4 、a 5It can be obtained by fitting the point source peak efficiency experimental value and h...

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Abstract

The invention provides a xenon source virtual point source scale device based on a point source efficiency function. The device comprises radioactive xenon sources, a standard mixing point source and a detector; the radioactive xenon sources are located at different heights over the detector; the standard mixing point source is located at the corresponding height over the detector; energy of rays emitted by the standard mixing point source must cover or approach to energy of rays emitted by the radioactive xenon sources. The 170Tm point source of long half-life is selected to be placed at the virtual point position of a 133Xe and isotope gas source of short half-life to simulate the efficiency of the scale radioactive 133Xe sources, and the problem that as some standard 133Xe and isotopes are short in half-life in actual working process, the use time is short can be solved.

Description

technical field [0001] The invention belongs to radiation detection technology, and in particular relates to a point source efficiency function calibration technology of a detector and a virtual point source technology of a radioactive source. Background technique [0002] Measuring xenon gas usually uses planar HPGeγ energy spectroscopy. The HPGe gamma energy spectroscopy method determines the activity by xenon isotope characteristic gamma rays. This method has simple equipment and high energy resolution, and is widely used in nuclide laboratories in various countries. The key to the HPGe gamma energy spectroscopy method is to determine the detection of the xenon radioactive source by the detector. efficiency. [0003] Chinese invention patent 201310617130.5 a method and device for calibrating xenon sample HPGe detection efficiency and 201310294436.1 surface source automatic simulation calibration gas source detection efficiency method and device system, mainly using surfa...

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Application Information

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IPC IPC(8): G01T1/167
Inventor 田自宁欧阳晓平张显鹏刘林月陈亮刘金良金鹏
Owner NORTHWEST INST OF NUCLEAR TECH
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