Journal of radiological science and technology (대한방사선기술학회지:방사선기술과학)

Korean Society of Radiological Science (대한방사선과학회)
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Scattering Measurement of Syringe Shield Used in PET/CT

PET/CT실에서 사용되는 주사기 차폐체의 산란선 측정

  • Jang, Dong-Gun (Dept. of Nuclear Medicine, Dongnam Institute of Radiological & Medical Sciences Cancer center) ;
  • Park, Cheol-Woo (Dept. of Radiological Technology, Dong-Eui Institute of Technology) ;
  • Park, Eun-Tae (Dept. Radiation Oncology, Busan Paik Hospital, Inje University)
  • 장동근 (동남권원자력의학원 핵의학과) ;
  • 박철우 (동의과학대학교 방사선과) ;
  • 박은태 (인제대학교 부산백병원 방사선종양학과)
  • Received : 2020.09.28
  • Accepted : 2020.10.23
  • Published : 2020.10.31
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Abstract

PET/CT is a medical equipment that detects 0.511 MeV of gamma rays. The radiation workers are inevitably exposed to ionizing radiation in the process of handling the isotope. Accordingly, PET/CT workers use syringe shields made of lead and tungsten to protect their hands. However, lead and tungsten are known to generate very high scattering particles by interacting with gamma rays. Therefore, in this study, we tried to find out the effect on the scattering particles emitted from the syringe shield. In the experiment, first, the exposure dose to the hand (Rod phantom) was evaluated according to the metal material (lead, tungsten, iron, stainless steel) using Monte Carlo simulation. The exposure dose was compared according to whether or not plastic is attached. Second, the exposure dose of scattering particles was measured using a dosimeter and lead. As a result of the experiment, the shielding rate of plastics using the Monte Carlo simulation showed the largest difference in dose of about 40 % in lead, and the lowest in iron, about 15 %. As a result of the dosimeter test, when the plastic tape was wound on lead, it was found that the reduction rate was about 15 %, 28 %, and 39 % depending on the thickness. Based on the above results, it was found that 0.511 MeV of gamma ray interacts with the shielding tool to emit scattered rays and has a very large effect on radiation exposure. However, it was considered that the scattering particles could be sufficiently removed with plastics with a low atomic number. From now on, when using high-energy radiation, the shielding tool and the skin should not be in direct contact, and should be covered with a material with a low atomic number.

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