Deb Pradip, Jamison Robert, Mong Lisa, U Paul
School of Medical Sciences, RMIT University, Bundoora West Campus, Victoria 3083, Australia
Peter MacCallum Cancer Centre, Melbourne 8006, Australia.
Radiat Prot Dosimetry. 2015 Jul;165(1-4):443-7. doi: 10.1093/rpd/ncv065. Epub 2015 Apr 5.
The purpose of this study is to evaluate the effectiveness of personal radiation shields currently worn in hospital and other diagnostic environments. This study was performed with four different radioisotopes; (18)F, (99m)Tc, (124)I and (131)I. (18)F results showed a decrease in dose with 0.5-mm Pb shielding but the reduction provided does not warrant its use clinically. (124)I testing demonstrated that dose enhancement can occur in greater shield thicknesses. PET isotope (124)I can be adequately shielded using 0.25-mm Pb equivalent aprons but any higher thickness increase the wearer's dose. As a result more shielding does not always equal more protection. The (131)I test showed that no dose reduction occurred, even when tested with up to 1.25-mm Pb equivalent shielding. Novel radioisotopes being used in the laboratory and clinic should be individually tested as each requires specific shielding testing.
本研究的目的是评估目前在医院和其他诊断环境中佩戴的个人辐射防护屏的有效性。本研究使用了四种不同的放射性同位素：（18）F、（99m）Tc、（124）I和（131）I。（18）F的结果显示，使用0.5毫米铅屏蔽时剂量降低，但所提供的降低幅度在临床上并不值得使用。（124）I测试表明，在更大的屏蔽厚度下可能会出现剂量增强。正电子发射断层显像（PET）同位素（124）I使用0.25毫米铅当量的防护围裙即可得到充分屏蔽，但任何更高的厚度都会增加佩戴者的剂量。因此，更多的屏蔽并不总是等于更多的防护。（131）I测试表明，即使使用高达1.25毫米铅当量的屏蔽进行测试，也没有出现剂量降低。实验室和临床中使用的新型放射性同位素应单独进行测试，因为每种同位素都需要特定的屏蔽测试。
