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

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 ...

AI Technical Summary

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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