X/gamma dosimeter field calibration method based on X-ray source and radiation protection system

Abstract

The invention belongs to the technical field of measurement of X-ray radiation, gamma ray radiation, particle radiation or cosmic ray radiation and discloses an X/gamma dosimeter field calibration method based on an X-ray source and a radiation protection system. A calibrator is a gamma dosimeter having the same type as an instrument to be calibrated; an energy response curve of the dosimeter; thesimulated energy response curve of the dosimeter is corrected through a response value of a specific energy point acquired via experiments; Monte Carlo software is utilized to simulate filter spectral features of X-ray; calibration coefficient k1 of the instrument to be calibrated is acquired; correction coefficient k2 is acquired; calibration coefficient k=k1*k2 is calculated. Scale coefficientski under different conditions can be acquired via X-rays having different energies, and a final scale coefficient is acquired by calculating. The method herein is simple to perform, has no radiationdamage during operation, and is of important practical significance to solving the measurement results accuracy problem of a fixed gamma dosimeter.

Description

technical field [0001] The invention belongs to the technical field of measurement of X-ray radiation, γ-ray radiation, microparticle radiation or cosmic ray radiation, and in particular relates to an X-ray source-based X / γ dosimeter on-site calibration method and a radiation protection system. Background technique [0002] At present, the existing technologies commonly used in the industry are as follows: In the practice of human ionizing radiation, radiation dosimetry has been involved in various fields such as industry, agriculture, military and medicine. From the perspective of radiation protection, the radiation level in the workplace should be monitored to protect the safety of operators and the public. In order to ensure the accuracy of the monitoring results, the dosimeters need to be calibrated regularly. The gamma dosimeter belongs to the category of environmental dose monitors in the workplace. Usually, the gamma dosimeter needs to be moved to a standard laborat...

AI Technical Summary

Problems solved by technology

When gamma rays pass through different attenuation layers, the energy will change, which will have a certain impact on the calibration of the instrument. For ionization chamber detectors, the energy deposited by the detector in the ionization chamber is counted, and the conversion coefficient is obtained. In the calculation process Use the conversion coefficient corresponding to the gamma ray energy corresponding to the Cs-137 source, and the energy change will affect the accuracy of the dose conversion result

Moreover, my country's control over radioactive sources is quite strict, and there are certain problems in the transportation of this device

During the transportation of radioactive sources, there may be risks such as radioactive source falling and radioactive leakage. Once this happens, it will cause immeasurable consequences

[0003] In summary, the problems in the prior art are: The energy of the radiation source of the existing portable multi-range reference radiation device is single. When the gamma rays pass through different attenuation layers, the energy will change, which will have a certain impact on the calibration of the instrument; there are also certain problems in transportation.

[0005] Difficulties: ①Acquisition and calibration of series calibration sources

Images