# 의료용 방사성동위원소의 종류에 따른 비스무트의 차폐율 평가

• Accepted : 2018.07.20
• Published : 2018.07.28
• 35 8

#### Abstract

In this study, $^{99m}Tc$, $^{123}I$, $^{201}Tl$, $^{18}F$, and $^{131}I$, which are widely used in nuclear medicine, were transmitted through a bismuth shield. We investigated the shielding rates according to the type of radioisotope and the distance of measurement. For the experiment, 6 sheets of lead equivalent 0.25 mm Pb of bismuth shielding material were stacked one by one up to 1.50 mm as the thickness increased. The distance was 30 cm, 50 cm, and 100 cm, and the transmission dose was measured. As a result, the shielding rates was measured as the thickness increased, and the measured value decreased as the distance increased. The shielding rate of $^{123}I$ and $^{201}Tl$ was higher than $^{99m}Tc$, $^{18}F$ and $^{131}I$ showed lower shielding effect when there is a shielding material than when there is no shielding material due to high energy and ${\beta}$ rays. Based on the results of experiments, it would be helpful to reduce the exposure of nuclear medicine workers and to manage the exposure if bismuth shields are used depending on the type of radioisotope.

#### References

1. Y. G. Kang. et al. (2015), Textbook of Nuclear Medicine, Seoul : Chunggu Publisher.
2. Y. I. Cho, (2016), Analysis of Shielding Device and Dose Assessment when Medical Radioisotope are Handled, master's thesis, Catholic University, Pisan.
3. ICRP, (2007), The 2007 Recommendations of the International Commission on Radiological Protection, Publication 103. Stockholm : ICRP.
4. J. I. Yoo & J. W. Koo, (2004), Musculoskeletal Symptoms and Related Factors for Nurses and Radiological Technologists Wearing a Lead Apron for Radiation Protection, Korean Journal Occup Environ Med, 16(2), 166-177.
5. J. S. Lee, (2012), An Effect of Radiation Shielding Board of Eyeball and Thyroid at the time of Chest and Abdomen CT scan, master's thesis, Kyungpook National University, Daegu.
6. J. H. Roh, (2012), A Study on the Manufacturing Technology for the Light-Weight Radiation-Proof Apron using Non-Toxic Lead-Free Materials, master's thesis, Korea University, Seoul.
7. J. S. Jeong, (2013), Study on the Radiation Dose Reduction of Radiosensitivity Critical Organs During CT Exam with Bismuth Shielding, master's thesis, Korea University, Seoul.
8. G. S. Nam, J. H. Kim, J. Y. Lee & H. H. Park, (2013), The Usability Evaluation According to the Application of Bismuth Shields in PET/CT Examination. Journal of Nucl Med Technol, 17(1), 36-42.
9. M. Y. Jung, D. C. Kweon & S. I. Kwon, (2009), Effectiveness of Bismuth Shield to Reduce Eye Lens Radiation Dose Using the Photoluminescence Dosimetry in Computed Tomography, Journal of Radiological Science and Technology, 32(3), 307-312.
10. Y. G. Kwak, C. Y. Kim & S. P. Jeong, (2014), Research on Dose Reduction During Computed Tomography Scanning by CARE kV System and Bismuth, Journal of Korea Contents Association, 14(8), 233-242. https://doi.org/10.5392/JKCA.2014.14.08.233
11. D. H. Kim & S. H. KIm, (2015), Convergence Performance Evaluation of Radiation Protection for Apron using the PSNR, Journal of Digital Convergence, 13(10), 377-383. https://doi.org/10.14400/JDC.2015.13.10.377
12. Ministry of Food and Drug Safety, (2011), Some revision notice of electronic medical device standard specification, MFDS Notice, No 2011-8.
13. E. J. Kim, et al, (2010), The Development of Standards of Diagnostic Medical X-ray Protection Apron.Glove, Screens.Glass Plates, Journal of FDC Regulatory Science, 5(1,2), 57-64.
14. U. M. Kujala, S. Taimela, T. Viljanen, (1996), Physical loading and Performance as Predictors of Back Pain in Healthy Adults, A 5-year Prospective Study, European Journal of Applied Physiology and Occupational Physiology, 73(5), 452-458. https://doi.org/10.1007/BF00334423
15. S. C. Kim & M. H. Park, (2010), Development of Radiation Shield with Environmentally-Friendly Materials;I: Comparison and Evaluation of Fiber, Rubber, Silicon in the Radiation Shielding Sheet, Journal of Radiological Science and Technology, 33(2), 121-126.
16. T. J. Choi, T. K. Oh, J. H. Kim & O. B. Kim, (2010), Development of Lead Free Shielding Material for Diagnostic Radiation Beams, Medical Physics, 21(2), 232-237.
17. M. H. Park & D. M. Kwon, (2007), Measurement of Apron Shielding Rate for X-ray and Gamma-ray, Journal of Radiological Science and Technology, 30(3), 245-250.
18. S. Y. Heo, et al, (2015), Evaluation of the Effectiveness of an Apron in Handling Radiopharmaceuticals within PET/CT Work Environment, Korean Society of Radiology, 9(2), 99-104.