Evaluation of the transmitted exposure through lead equivalent aprons used in a radiology department, including the contribution from backscatter
Evaluation of the transmitted exposure through lead equivalent aprons used in a radiology department, including the contribution from backscatter
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DOI：
10.1118/1.1573207
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发表时间：
2003-06-01
期刊：
影响因子：
3.8
通讯作者：
Chan, HP
中科院分区：
文献类型：
--
作者：
Christodoulou, EG;Goodsitt, MM;Chan, HP
进行了一项研究来评估放射科使用的铅当量围裙的辐射传输情况。采用大面积光束（不良几何形状）进行透射测量，并通过在每个挡板后面放置 7" 有机玻璃来模拟反向散射。使用单独的电离室来测量入射和透射 X 射线束。通过来自八个不同供应商的挡板和防护罩（标记为 0.25 毫米和 0.5 毫米铅当量）在 70 kVp 和 100 kVp 下进行透射测量。 还测量了 0.254 毫米和 0.508 毫米的纯铅，并与通过铅等效材料的透射率进行比较。此外，还测量了围裙的面积密度，以比较辐射透射率与围裙重量的关系。在 70 kVp 时，通过 0.254 mm 纯铅的透射率为 5.4%，通过 0.25 mm 铅等效材料的透射率为 4.3% 至 10.2%，其中 平均值为 7.1%，标准差 (s.d.) 为 1.4%。在 100 kVp 时，0.254 mm 纯铅的值为 15%，0.25 mm 铅等效材料的值为 12.3% 至 20.7%（平均值 16.8%，s.d. 2.1%）。 70 kVp 时，通过 0.508 mm 纯铅样品的透射率为 0.9%，通过 0.5 mm 铅样品的相应透射率 等效材料为 0.6% 至 1.6%（平均值 1.0%，标准差 0.2%）。在 100 kVp 时，通过 0.508 mm 铅样品的透射率为 5%，通过 0.5 mm 铅等效材料的透射率为 3.5% 至 6.7%（平均值 4.9%，s.d. 0.7%）。 70 kVp 下，通过两个“无铅”0.5 毫米铅当量围裙的辐射传输率为 1.7%， 1.9% 和 100 kVp 时的传输率分别为 6.1% 和 6.8%。这项研究表明，需要建立围裙验收测试的方法，并需要确定特定 kVp 值下围裙 X 射线透射的验收限值。还需要制定辐射防护围裙常规质量保证测试的适当方法和频率。 0 2003 年美国医学物理学家协会。
A study was conducted to evaluate the radiation transmission through lead equivalent aprons that are used in a radiology department. A large area beam (poor geometry) was employed for the transmission measurements, and backscatter was simulated by placing 7" of Lucite behind each apron. Separate ionization chambers were used to measure the incident and transmitted x-ray beams. Transmission measurements were made at 70 kVp and 100 kVp through aprons and protective shields from eight different vendors that were marked 0.25 mm and 0.5 mm lead equivalent. Transmissions through 0.254 mm and 0.508 mm of pure lead were also measured and were compared with the transmissions through the lead equivalent materials. In addition, the area densities of the aprons were measured to compare radiation transmission with respect to the weights of the aprons. At 70 kVp the transmission through 0.254 mm of pure lead was 5.4% and the transmissions through the 0.25 mm lead equivalent materials were 4.3% to 10.2% with a mean value of 7.1% and a standard deviation (s.d.) of 1.4%. At 100 kVp, the values were 15% for 0.254 mm pure lead and 12.3% to 20.7% (mean 16.8%, s.d. 2.1%) for the 0.25 mm lead equivalent materials. The transmission through the 0.508 mm pure lead sample was 0.9% at 70 kVp, and the corresponding transmissions through the 0.5 mm lead equivalent materials were 0.6% to 1.6% (mean 1.0%, s.d. 0.2%). At 100 kVp, the transmission through the 0.508 mm lead sample was 5% and those through the 0.5 mm lead equivalent materials were 3.5% to 6.7% (mean 4.9%, s.d. 0.7%). The radiation transmissions at 70 kVp, through two "lead-free" 0.5 mm lead equivalent aprons, were 1.7% and 1.9% and at 100 kVp the transmissions were 6.1% and 6.8%, respectively. This study indicates that there is a need to establish methods for acceptance testing of aprons and a need to establish acceptance limits for the x-ray transmission of aprons at specific kVp values. There is also a need for the establishment of appropriate methods and frequencies of routine quality assurance testing of radiation protection aprons. 0 2003 American Association of Physicists in Medicine.