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A Tissue Equivalent Proportional Counter Online Calibration Method

A proportional counter and tissue equivalent technology, applied in the direction of instruments, radiation intensity measurement, radiation measurement, etc., can solve the problems of inapplicable equivalent proportional counters, and achieve the effect of solving online calibration problems

Active Publication Date: 2019-03-12
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this calibration method is not suitable for tissue equivalent proportional counters based on gas electron multiplication technology.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0021] Apply the tissue equivalent proportional counter online calibration method of the present invention to the online calibration of a tissue equivalent proportional counter based on gas electron multiplication technology, the steps are as follows:

[0022] (1) Take one 241 Amα source and a 55 The Fe low-energy X-ray source is used as a calibration source, and the energy of the calibration source is known;

[0023] (2) Two calibration holes are set on the tissue equivalent material cathode plate of the tissue equivalent proportional counter to be calibrated, and the calibration holes can be blind holes or through holes;

[0024] (3) When the calibration hole is a blind hole, the calibration source is arranged on the bottom surface of the blind hole; when the calibration hole is a through hole, the calibration source is arranged directly above the through hole;

[0025] (4) On the positions corresponding to the two calibration holes on the anode plate of the equivalent pro...

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Abstract

The invention relates to a calibration method of a radiation detection device to solve the problem that no online calibration methods for tissue equivalent proportional counters based on a gas electron multiplication technique is available, and provides an online calibration method for a tissue equivalent proportional counter. The calibration method comprises the following steps: (1) an alpha source and a low-energy X ray source with known energy are taken as calibration sources; (2) calibration holes are formed; (3) the calibration sources are placed; (4) anode plate signal collection regions are set; (5) the largest deposition energy of alpha particles and electrons in corresponding sensitive chambers and the pulse amplitude spectrum of a to-be-calibrated tissue equivalent proportional counter are acquired; (6) the linear energy spectrum measured by the to-be-calibrated tissue equivalent proportional counter is calculated, and calibration is completed. With the adoption of the calibration method, the calibration result can cover an extremely wide linear energy spectrum covering three orders of magnitudes, and the online calibration problem of the tissue equivalent proportional counter based on the gas electron multiplication technique is solved better.

Description

technical field [0001] The invention relates to a calibration method of a radiation detection device, in particular to an online calibration method of a tissue equivalent proportional counter. Background technique [0002] The tissue equivalent proportional counter is a detector used to evaluate the relative biological effects of radiation, which can directly obtain the absorbed dose (rate) by simulating and measuring the micro-dose spectrum (also known as the line energy spectrum) of micron-scale cell tissue in the radiation field and dose equivalent (rate), which can be used in space radiation, radiation protection, microdosimetry, radiation therapy and other fields. [0003] The tissue equivalent proportional counter has the advantages of wide measurement range of line energy, good particle resolution ability, suitable for dose measurement of spatially mixed radiation field, etc., so it has been widely recognized in the world. At present, the tissue equivalent proportion...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01T7/00G01T1/18
CPCG01T1/18G01T7/005
Inventor 张伟华李春娟王志强刘毅娜骆海龙李玮
Owner CHINA INSTITUTE OF ATOMIC ENERGY