Measurement and analysis of induced radioactivity in medical electronic linear accelerator
10.13491/j.issn.1004-714X.2021.05.014
- VernacularTitle:医用电子直线加速器感生放射性的测量和分析
- Author:
Bin JIA
1
;
Jianguo ZHU
2
;
Shuhui YANG
2
;
Fei NIU
2
;
Feng LU
2
;
Lin ZHANG
2
;
Nan MIN
2
Author Information
1. The Supervision and Enforcement Institute of Municipal Health Commission of Hengshui, Hengshui 053000 China.
2. School of Preventive Medicine Sciences (Institute of Radiation Medicine), Shandong First Medical University (Shandong Academy of Medical Sciences), Jinan 250062 China.
- Publication Type:RadiationMonitoring/OriginalArticles
- Keywords:
Medical Electron Accelerator;
Induced Radioactivity;
X-ray;
Neutron
- From:
Chinese Journal of Radiological Health
2021;30(5):592-596
- CountryChina
- Language:Chinese
-
Abstract:
Objective By measuring the induced radioactivity of the medical electron linear accelerator, and analyzing the measuring results and the measuring process, the cooling law of the induced radioactivity was studied, to provide basic data for evaluating additional doses to patients, medical staff and the public. Methods Five Medical Electron Linear accelerators were used to measure the induced radioactivity by using automes-6150AD6/H+6150AD-b/H x-γ radiation peripheral dose equivalent rate meter for environmental monitoring. Results The level of induced radioactivity of 5 medical electron linear accelerators is related to the factors such as measuring position and time: 10 second after the end of beam output, the maximum dose equivalent rate is 5.55 μSv/h around 5 cm on the surface of the head housing of the accelerator, and the maximum ambient dose equivalent rate at 1 m from the fixed point of the housing is 4.07 μSv/h, 5 minutes after the end of output, the maximum dose equivalent rate is 2.11 μSv/h around the 5 cm surface and 1.77 μSv/h around the 1 m fixed point. Conclusion The measured radioactivity induced by the medical electron linear accelerator gradually cools over time, the measurement valuesare maintained in a relatively fixed range, and the fluctuation range of the values is narrow.
