X/gamma and beta personal dose equivalent measuring method based on laminated detection structure

A dose equivalent and measurement method technology, applied in the field of ionizing radiation testing, can solve problems such as differences in instrument measurement values ​​and affecting effective monitoring by staff, and achieve the effect of avoiding mutual interference

Active Publication Date: 2019-04-26
SILKWORM COCOON RES GROUP CHINESE INST OF TEST TECH
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Problems solved by technology

When in the X / γ-ray and β-ray mixed field, there will be obvious differences between the measured value of the instrument and the actual value, which will affect the effective monitoring of the dose received by the staff

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  • X/gamma and beta personal dose equivalent measuring method based on laminated detection structure

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[0020] The present invention will be described in detail below with reference to the drawings and specific embodiments. The present invention mainly realizes the personal dose equivalent measurement problem in the mixed field that X / γ ray and β ray form, and its realization principle is mainly to utilize the penetrability difference of X / γ ray and β ray (beta ray penetrating ability is weak, X / γ-ray penetrating ability), by superimposing different attenuation materials on the front of two Si-PIN detectors, combined with a stacked detection structure to achieve personal dose equivalent measurement in X / γ and β mixed fields.

[0021] In the present invention, X / γ-ray and β-ray personal dose equivalent measurement adopts a stacked detection structure, and its realization structure is as follows figure 1 As shown, it mainly includes the first metal material, such as Al (in the case of relatively thin thickness, Cu can be used), the first Si-PIN detector and the back-end measureme...

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Abstract

The invention discloses an X / gamma and beta personal dose equivalent measuring method based on a laminated detection structure, and solves the problem of X / gamma and beta mixed field measurement by adopting the laminated structure. The laminated structure is formed by stacking two Si-PIN detectors, the front end of the first Si-PIN detector adopts a first metal material to improve the energy response of beta rays, a second metal material is adopted between the first Si-PIN detector and the second Si-PIN detector to achieve the shielding of beta rays and improve the energy response of the second Si-PIN detector when measuring X / gamma rays; the first Si-PIN detector is responsible for detecting beta rays, and the second Si-PIN detector is responsible for detecting X / gamma rays, if two Si-PINdetectors have information output at the same time, the rays can be judged as X / gamma rays through a coincidence circuit, and the counting of a channel of the first Si-PIN detector at the moment canbe removed. The method can accurately and efficiently measure X / gamma ray and beta ray individual dose equivalent in the mixed field simultaneously, and also can avoid mutual interference produced inthe course of measuring X / gamma rays and beta rays by using a prior instrument.

Description

technical field [0001] The invention relates to the technical field of ionizing radiation testing, in particular to a method for measuring X / γ and β ray personal dose equivalents based on a laminated detection structure. Background technique [0002] The direct-reading personal dosimeter is mainly used for real-time monitoring of personal dose of external exposure (such as X / γ-ray and β-ray), and its measured value (refer to the relevant limit value of the national standard) can be used to limit the dose received by the staff . Direct-reading personal dosimeters mainly use Si-PIN semiconductors as nuclear radiation detectors due to limitations in size, power consumption, and cost. Since some radiation workplaces involve radiation of different particle types, for example, some working areas inside nuclear power plants and nuclear radiation medical sites will involve mixed fields of X / γ-rays and β-rays. One of the problems that needs to be solved in personal dose equivalents ...

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Application Information

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IPC IPC(8): G01T1/02
CPCG01T1/026
Inventor 黄平刘雪梅熊秋锋杨润东
Owner SILKWORM COCOON RES GROUP CHINESE INST OF TEST TECH
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