Evaluation of radiation protection effect of two kinds of layouts of afterloading irradiation treatment room(PDF)
《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]
- Issue:
- 2018年第5期
- Page:
- 532-536
- Research Field:
- 医学放射物理
- Publishing date:
Info
- Title:
- Evaluation of radiation protection effect of two kinds of layouts of afterloading irradiation treatment room
- Author(s):
- DU Wen; MA Xiaochun; CAI Hongyi; GUO Yixiao
- Department of Radiotherapy, Gansu Provincial Hospital, Lanzhou 730000, China
- Keywords:
- ; high dose rate afterloading radiotherapy; radiation protection; weekly effective dose; distance
- PACS:
- R146
- DOI:
- DOI:10.3969/j.issn.1005-202X.2018.05.007
- Abstract:
- Objective To calculate the theoretical and experiment value of weekly effective dose at each monitoring site (cable hole, console, lead gate, waiting room) in different layouts of afterloading irradiation treatment room, and provide data support for improving the radiation protection for occupation personnel. Methods Based on the inverse square law and exponential law of the attenuation of X-ray intensity, the calculation formula of weekly effective dose at each monitoring site was derived, and the weekly effective dose at each monitoring site with the radioactive source at different locations was calculated. When the activity of the radioactive source which was placed at different locations reaches the maximum, MEDCOM Inspector Alert Handheld Surface Contamination Meter was used to measure the air kerma rate at each monitoring site. Finally, the weekly effective dose at each monitoring site was obtained by calculating weekly workload. Results After considering the distance, the theoretical value of weekly effective dose at each monitoring site (cable hole, console, lead gate, waiting room) was reduced from 13.00, 30.90, 0.012 10, 1.200 μSv to 2.08, 2.29, 0.004 75, 0.564 μSv, respectively. The experiment value was decreased from 4.32, 25.60, 2.01, 1.96 μSv to 2.16, 2.96, 1.55, 1.41 μSv, respectively. Conclusion The layout of afterloading irradiation treatment room with the consideration of the distance significantly reduces the weekly effective dose of the occupation personnel.
Last Update: 2018-05-22