| LUO Su-ming,HE Zhi-jian,YUAN Ji-long,YUE Bao-rong,WEI Ke-dao.Development of measurement method using TLD for workers occupation personally exposed to 125I seed source in the implant[J].Chinese Journal of Radiological Medicine and Protection,2011,31(4):398-403 |
| Development of measurement method using TLD for workers occupation personally exposed to 125I seed source in the implant |
| Received:March 28, 2010 |
| DOI：10.3760/cma.j.issn.0254-5098.2011.04.006 |
| KeyWords:TLD 125I seed source implantation Occupational exposure Average absorbed dose Effective dose |
| FundProject:国家科技支撑计划(2006BAI06B03) |
| Author Name | Affiliation | E-mail | | LUO Su-ming | National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | | HE Zhi-jian | National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | | YUAN Ji-long | National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | | YUE Bao-rong | National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | bryue@163.com | | WEI Ke-dao | National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | |
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| Abstract:: |
| Objective To explore the method for measuring and calculating both absorbed dose and effective dose received in organ and tissues of occupational workers by using TLDs for the implantation of 125I seed sources. Methods The experiments with 60Co γ-rays were carried out for the stability. A group of TLD chips was exposed to 125I seed sources to establish standard dose curve for air kerma. During the 125I seed implantation, the TLD chips were pasted to 13 locations like thyroid inside and outside the lead aprons worn by occupational workers to measure average absorbed dose and calculate the absorbed doses and effectives to organs and tissues. Results For 3 cases of prostate cancers with implantation of 125I seeds, the worker's organs and tissues received the absorbed dose 0.02-3.80 μGy and effective dose 0.06-1.81 μSv outside lead aprons and the highest absorbed dose 2.35 μGy and effective 0.02 μSv inside lead aprons, respectively, with more than 65.9% of rays shielded. For 3 cases of brain cancers with implantation of 125I seeds, the workers received the absorbed dose 0.23-11.31 μGy and effective dose 0.88-4.07 μSv outside lead aprons and the highest absorbed dose 2.22 μGy and effective dose 0.09 μSv inside lead aprons, respectively, with more than 54.5% of rays shielded. For 3 cases of lung cancers with implantation of 125I seeds, the workers received the absorbed dose 0.03-14.78 μGy and effective dose 0.35-7.59 μSv outside lead aprons and the highest absorbed dose 4.09 μGy and effective 0.22 μSv inside lead aprons, respectively, with more than 58.4% of rays shielded. For 2 cases of mediastinum cancers with implantation of 125I seeds, the workers received the absorbed dose 0.06-74.91 μGy and effective dose 0.83-17.96 μSv outside lead aprons and the highest absorbed dose 10.29 μGy and effective 0.5 μSv inside lead aprons, respectively, with more than 85% of rays shielded. For one case of ovary cancer with implantation of 125I seeds, the worker received the absorbed dose 0.09-14.29 μGy and effective dose 2.40-4.50 μSv outside lead aprons and the highest absorbed dose 7.77 μGy and effective 0.12 μSv inside lead aprons, respectively, with more than 34% of rays shielded. For one case of eye cancer with implantation of 125I seeds, the workers received the absorbed dose 2.2-39.84 μGy and effective dose 4.48-10.06 μSv outside aprons and the highest absorbed dose 5.19 μGy and effective 0.16 μSv inside aprons, respectively, with more than 54.6 % of rays shielded. Conclusions The method of using TLDs to measure the doses to the occupational workers in the course of the implantation of 125I seed sources is simple and easy to operate. It would be an effective approach to protecting medical workers in the case of brachytherapy. |
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