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피부선량을 기준으로 0.511 MeV 감마선에 대한 납 차폐체의 산란선 및 차폐 효율 분석

Analysis of Scattering Rays and Shielding Efficiency through Lead Shielding for 0.511 MeV Gamma Rays Based on Skin Dose

방사선기술과학 2020년 43권 4호 p.259 ~ 264
장동근, 박은태,
소속 상세정보
장동근 ( Jang Dong-Gun ) - Dongnam Institute of Radiological and Medical Sciences Cancer Center Department of Nuclear Medicine
박은태 ( Park Eun-Tae ) - Inje University Busan Paik Hospital Department of Radiation Oncology

Abstract


Radiation causes radiation hazards in the human body. In Korea, a case of radiation necrosis occurred in 2014. In this study, the scatter and shielding efficiency according to lead shielding were classified into epidermis and dermis for 0.511 MeV used in nuclear medicine. In this study, experiments were conducted using the slab phantom that represents calibration and the dose of human trunk. Experimental results showed that the shielding rate of 0.25 mmPb was 180% in the epidermis and 96% in the dermis. Shielding at 0.5mmPb showed shielding rates of 158%in the epidermis and 82% in the dermis. As a result of measuring the absorbed dose by subdividing the thickness of the dermis into 0.5 mm intervals, when the shielding was carried out at 0.25 mmPb, the dose appeared to be about 120% at 0.5 mm of the dermis surface, and the dose was decreased at the subsequent depth. Shielding at 0.5 mmPb, the dose appeared to be about 101% at the surface 0.5 mm, and the dose was measured to decrease at the subsequent depth. This result suggests that when lead aprons are actually used, the scattering rays would be sufficiently removed due to the spaces generated by the clothes and air, Therefore, the scattered ray generated from lead will not reach the human body. The ICRU defines the epidermis (0.07), in which the radiation-induced damage of the skin occurs, as the dose equivalent. If the radiation dose of the dermis is considered in addition, it will be helpful for the evaluation of the prognosis for radiation hazard of the skin.

키워드

산란선; 피부; 방사선방어용앞치마; 양전자방출단층촬영장치; 차폐
Scatter; Skin; Apron; PET/CT; Shielded

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