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Preparation and detection efficiency correcting method for <133>Xe simulated gas source

A detection efficiency, gas source technology, applied in radiation measurement, X-ray energy spectrum distribution measurement, instruments, etc., can solve the problems of large deviation, cumbersome and error, and achieve the effect of small deviation, accurate scale and reliable measurement results

Active Publication Date: 2018-12-25
CHINA INSTITUTE OF ATOMIC ENERGY
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Problems solved by technology

[0003] Chinese patent application 201310294436.1 discloses a radioactive area source automatic analog scale gas source detection efficiency device and method to avoid 133 The tediousness and error of Xe detection efficiency calculation
The principle of this patent is to calculate the gas source efficiency by dynamically measuring the surface source detection efficiency, but the deviation is still large

Method used

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  • Preparation and detection efficiency correcting method for &lt;133&gt;Xe simulated gas source
  • Preparation and detection efficiency correcting method for &lt;133&gt;Xe simulated gas source
  • Preparation and detection efficiency correcting method for &lt;133&gt;Xe simulated gas source

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Embodiment Construction

[0057] Exemplary of the invention 133 The preparation of the Xe simulated gas source and the detection efficiency calibration method include the following steps.

[0058] (1) Add a small amount of 0.5 μl resin glue containing vinyl alcohol molecules on the surface of each low-density EPS foam material particle (2-6mm in diameter), and add 1 μl dropwise through the tip of the automatic liquid dispenser 133 Ba radioactivity standard solution.

[0059] (2) Dry the low-density EPS foam material particles obtained in step (1) with an infrared lamp for 1-2 hours, mix them evenly on a shaker, and put them into a 100ml cylindrical analog source box to make 133 Ba analog source.

[0060] (3) prepared by the high-purity germanium detector measurement step (2) 133 The 81keV γ peaks of the Ba analog source were counted and calculated to obtain 133 The detection efficiency ε of Ba, its calculation formula is:

[0061]

[0062] in:

[0063] N is the gamma peak count;

[0064] P γ...

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Abstract

The invention belongs to the technical field of radioactive gas sources, and relates to a preparation and detection efficiency correcting method for a <133>Xe simulated gas source. The preparation anddetection efficiency correcting method comprises the following steps that (1) a trace of resin glue containing vinyl alcohol molecules is added on the surface of each EPS particle, and 1[mu]l <133>Baradioactive standard solution is dropped; (2) the EPS particles obtained in the step (1) are dried and evenly mixed and then put into a simulation source box to make a <133>Ba simulation source; (3)the gamma-peak count of the <133>Ba simulation source prepared in the step (2) is measured through a gamma-ray spectrometer, and the detection efficiency of <133>Ba is obtained through calculation; (4) a <133> Xe gas source is prepared; (5) the gamma-peak count of the <133>Xe gas source prepared in the step (4) is measured through the gamma-ray spectrometer, and the detection efficiency of <133>Xeis obtained through calculation; and (6) the efficiency transmission factor of the <133>Ba simulation source is calculated according to the detection efficiency calculation results of the step (3) and the step (5). Through the preparation and detection efficiency correcting method, the detection efficiency calibration for gamma-ray spectrometer measurement of the <133>Xe can be simulated, the calibration is more accurate, and deviation is obviously smaller.

Description

technical field [0001] The invention belongs to the technical field of radioactive gas sources, and relates to a 133 Preparation of Xe simulated gas source and detection efficiency calibration method. Background technique [0002] radioactive noble gas nuclides 133 Xe is one of the main nuclides monitored in the field of nuclear facilities, and its γ-ray energy is low. to include 133 Quantitative measurement of Xe radioactive gas samples requires calibration of the detection efficiency of the gamma spectrometer, but 133 The half-life of Xe is too short to be suitable for making standard sources for long-term storage. Therefore, currently 133 The detection efficiency of Xe is mainly calculated by the passive efficiency calibration software. The calculation principle is as follows: first, the gas source is divided to form a point source or an area source, and then the relative detection efficiency of the point source or area source is integrated and calculated, and the vo...

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Application Information

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IPC IPC(8): G01T7/00G01T1/36
CPCG01T1/36G01T7/005
Inventor 吕晓侠杨巧玲刁立军武昌平姚顺和孟军
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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