Individual dose equivalent meter calibration new method

Abstract

The invention provides an individual dose equivalent meter calibration new method. When deep personal dose equivalent Hp(10), superficial individual dose equivalent Hp(0.07) and eye crystal dose equivalent Hp(3) individual dose equivalent meter calibration is carried out, a reference dose point (RDP) of a calibrated dosimeter is selected as Hp(d) in a die body, that is, the calibration reference point is in the die body and is at a distance of d mm from the surface in a ray vertical incident direction; and irradiation distance between a standard radiation source center (or an X-ray tube focus) and the d place of the corresponding die body calibration reference points is determined. The new method, on one hand, accords with Hp(d) individual dose equivalent definitions regulated by related international standard (ISO 4037) and national standard (GB 12162) in China, and on the other hand, improves accuracy of individual dose equivalent monitoring and scientificity of occupational hazard evaluation of massive radiation workers.

Description

technical field [0001] The invention relates to a new calibration method of a personal dose equivalent meter, which uses the reference point of the scaled dosimeter to be selected as the reference point in the phantom. H At p(d), that is, the reference point of the scale is the vertical incident direction of the ray, inside the phantom, and at a depth of "d" mm from the surface. . Background technique [0002] When the personal dose equivalent meter is calibrated in the metrology and testing institution (or standard dosimetry laboratory), in order to trace the source of radiation dose and transfer accuracy, it is necessary to accurately determine the distance from the center of the standard radioactive source (or X-ray tube focus) to the reference point of the scale . According to the existing international and domestic calibration methods (GBZ 207-2008 Specifications for Performance Inspection of External Exposure Personal Dose System), the reference dose point (RDP) of t...

AI Technical Summary

Problems solved by technology

On the other hand, artificially increasing the distance between the personal dose equivalent meter detector and the standard radioactive source center (or X-ray tube focus) actually reduces the received dose rate and cumulative dose value, resulting in a larger scale factor

After hundreds of thousands of personal dose equivalent meters are calibrated by this method, in the actual use of personal dose equivalent meters, the monitoring results will be inaccurate, and even the overall personal dose equivalent evaluation level will be affected.

Images