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KMID : 1143620140180010110
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Korean Journal of Nuclear Medicine Technology
2014 Volume.18 No. 1 p.110 ~ p.114
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A Consideration of Apron's Shielding in Nuclear Medicine Working Environment
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Lee Seong-Wook
Kim Seung-Hyun
Ji Bong-Geun
Lee Dong-Wook
Kim Jeong-Soo
Kim Gyeong-Mok
Jang Young-Do
Bang Chan-Seok
Baek Jong-Hoon
Lee In-Soo
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Abstract
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Purpose: The advancement in PET/CT test devices has decreased the test time and popularized the test, and PET/CT tests have continuously increased. However, this increases the exposure dose of radiation workers, too. This study aims to measure the radiation shielding rate of 18F-FDG with a strong energy and the shielding effect when worker wore an apron during the PET/CT test. Also, this study compared the shielding rate with 99mTC to minimize the exposure dose of radiation workers.
Materials and Methods: This study targeted 10 patients who visited in this hospital for the PET/CT test for 8 days from May 2nd to 10th 2013, and the 18F-FDG distribution room, patient relaxing room (stand by room after 18F-FDG injection) and PET/CT test room were chosen as measuring spots. Then, the changes in the dose rate were measured before and after the application of the APRON. For an accurate measurement, the distance from patients or sources was fixed at 1M. Also, the same method applied to 99mTC's Source in order to compare the reduction in the dose by the Apron.
Results: 1) When there was only L-block in the 18F-FDG distribution room, the average dose rate was 0.32 μSv, and in the case of L-blockK+ apron, it was 0.23 μSv. The differences in the dose and dose rate between the two cases were respectively, 0.09 μSv and 26%. 2) When there was no apron in the relaxing room, the average dose rate was 33.1 μSv, and when there was an apron, it was 22.3 μSv. The differences in the dose and dose rate between them were respectively, 10.8 μSv and 33%. 3) When there was no APRON in the PET/CT room, the average dose rate was 6.9 μSv, and there was an APRON, it was 5.5 μSv. The differences in the dose and dose rate between them were respectively, 1.4 μSv and 25%. 4) When there was no apron, the average dose rate of 99mTC was 23.7 μSv, and when there was an apron, it was 5.5 μSv. The differences in the dose and dose rate between them were respectively, 18.2 μSv and 77%.
Conclusion: According to the result of the experiment, 99mTC injected into patients showed an average shielding rate of 77%, and 18F FDG showed a relatively low shielding rate of 27%. When comparing the sources only, 18F FDG showed a shielding rate of 17%, and 99mTC's was 77%. Though it had a lower shielding effect than 99mTC, 18F-FDG also had a shielding effect on the apron. Therefore, it is considered that wearing an apron appropriate for high energy like 18F-FDG would minimize the exposure dose of radiation workers.
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KEYWORD
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Apron, Dose rate, Shielding rate
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