A method for measuring radiation dose

Abstract

The invention discloses a radiation dose measurement method. The method comprises steps of 1) using a scintillator detector to detect a radiation ray of a radiation field so as to obtain the power spectrum channel address C and the power spectrum of the radiation ray of the radiation field; 2) using a dead time correction factor of the scintillator detector to perform dead time correction to the power spectrum, so as to obtain the power spectrum N (C) after the dead time correction; 3) performing calculation according to a formula as described in the specification to obtain the air absorbed dose rate Da of the radiation ray, A(k) denoting the coefficient of the power spectrum-dose conversion function J(S(C)) polynomial of the scintillator detector, S(C) denoting the channel address of the standard power spectrum corresponding to the power spectrum channel address C, B(i) denoting the polynomial coefficient, C denoting the polynomial variable, and i denoting the polynomial exponential. The method expands the usage range of the scintillator-type radiation dose detector.

Description

Technical field: [0001] The invention belongs to the field of nuclear radiation detection and relates to a nuclear radiation dose measurement method. Background technique: [0002] Absorbed dose D refers to the average energy absorbed by the irradiated substance per unit mass, which describes the radiation energy absorbed by the substance and the radiation effect that may be caused. The unit of D is: Gy (Gray), 1Gy=1J kg -1 . However, when the human body receives the same absorbed dose, if the type, energy or irradiation conditions of the radiation are different, the biological effects caused by it will also be different in severity and probability of occurrence (reference: Qian Jianfu, Shen Tingyun. Nuclear Radiation Dosimetry [M]. Beijing: National Defense Industry Press, 2009.7-24; Tang Bin et al. Principles of Nuclear Radiation Measurement [M]. Harbin: Harbin Engineering University Press, 2011.53.). [0003] In order to uniformly describe the degree of harm of differe...

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Problems solved by technology

[0014] The method is convenient and simple, and the radiation measurement accuracy is high; in the process of obtaining the G function, it is necessary to measure the energy spectrum of several standard radiation fields and the corresponding dose, and the G functions of different scintillation detectors are not the same, so for multiple scintillation radiation dose detection The detectors need to obtain independent G functions respectively, which limits the universal applicability of the G functions, especially when thousands of scintillation radiation dose detectors need to be developed, the acquisition of the G functions will be very difficult; another On the one hand, due to the dead time of the system composed of detectors and electronics, the radiation intensity detected by the detector is not exactly the same as the radiation intensity output by the detector, and the traditional G function method does not take this factor into account, which limits The G-function method can only be applied in low-intensity radiation fields

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