Al-Shakhrah I A, Abu-Khaled Y S
Department of Physics, The University of Jordan, Amman, Jordan.
Heart Lung. 2000 Nov-Dec;29(6):417-23. doi: 10.1067/mhl.2000.109696.
The goal of this study was to estimate the effective radiation dose for the physicians and staff members in contrast angiocardiography.
The study design was a quasi-experimental, random assignment.
A medical center in Jordan that specializes in cardiology and routinely applies fluoroscopy and contrast angiocardiography was the study setting.
Subjects included 235 radiation workers.
Outcome measures included thermoluminescent dosimeter measurements of radiation dose to the skin and whole body over the lead apron, as well as dose to the whole body under the lead apron.
The period of this study was 6 years (1990 to 1995). Researchers distributed 1880 thermoluminescent dosimeters (TLDs) to 235 radiation workers during this period. The TLDs were positioned on the trunk of each worker between the waist and shoulder, which is the area of the body with the highest exposure rate. The study included results from 65% of the participants; 35% were excluded because analysis of the collected data indicated that in 14.5% of the participants, the TLDs were positioned incorrectly (TLDs specified for under apron were positioned over collar and vice versa), and 20.5% of the participants rarely or never wore the TLDs issued to them from the National Radiation Protection Laboratory.
The results show that the values of effective dose obtained by the proposed method are in reasonable agreement with other previously published methods. The mean annual effective dose is 2.5 +/- 2.6 millisievert, with a maximum of 16.2 millisievert. The values of mean and maximum effective doses represent approximately 12.5% and 81% of the annual effective radiation dose limit suggested by the International Commission on Radiological Protection.
The use of 2 dosimeters, one to measure the dose transmitted through the lead apron and another to sample the dose at the neck, will allow for an estimate of effective dose in reasonable agreement with other published methods. The proposed method is developed from conservative assumptions that result in a slightly higher effective dose than those that result from applying a correction factor for a single-collar dosimeter.
本研究的目的是估算心脏造影检查中医师和工作人员所接受的有效辐射剂量。
研究设计为准实验性随机分配。
约旦一家专门从事心脏病学研究且常规应用荧光镜检查和心脏造影检查的医疗中心为研究地点。
受试者包括235名辐射工作人员。
观察指标包括用热释光剂量计测量铅衣外皮肤和全身的辐射剂量，以及铅衣内全身的剂量。
本研究为期6年（1990年至1995年）。在此期间，研究人员向235名辐射工作人员发放了1880个热释光剂量计（TLD）。TLD放置在每名工作人员腰部至肩部之间的躯干上，该部位是身体暴露率最高的区域。该研究纳入了65%参与者的结果；35%被排除，因为对收集数据的分析表明，14.5%的参与者TLD放置错误（指定用于铅衣下的TLD放置在领口上方，反之亦然），20.5%的参与者很少或从未佩戴国家辐射防护实验室发放给他们的TLD。
结果表明，所提方法获得的有效剂量值与其他先前发表的方法合理一致。年平均有效剂量为2.5±2.6毫希沃特，最高为16.2毫希沃特。平均和最大有效剂量值分别约为国际放射防护委员会建议的年有效辐射剂量限值的12.5%和81%。
使用两个剂量计，一个测量透过铅衣的剂量，另一个在颈部取样剂量，将能够估算出与其他已发表方法合理一致的有效剂量。所提方法基于保守假设得出，其有效剂量略高于对单领口剂量计应用校正因子得出的有效剂量。
