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Simulation of Energy Absorption Distribution using of Lead Shielding in the PET/CT

PET/CT 검사에서 납 차폐체 사용에 따른 에너지 흡수 분포에 관한 모의실험

Jang, Dong-Gun;Kim, Changsoo;Kim, Junghoon
장동근;김창수;김정훈

  • Received : 2015.09.23
  • Accepted : 2015.12.25
  • Published : 2015.12.31

Abstract

Energy absorption distribution according to lead shielding for 511 keV ${\gamma}$ ray was evaluated using a Monte Carlo simulation in PET/CT. Experimental method was performed about the depth of skin surface(0.07), lens(3) and the depth(10) was conducted by using ICRU Slab phantom. Difference of energy absorption distribution according to lead thickness and effect of air gap according to distance of lead and phantom. As a result, study showed that using a lead shielding makes high energy distribution by backscatter electron. As a distance between lead and phantom increased, energy absorption distribution gradually decreased. 9 cm or more air gap should exist to prevent effect of backscatter electron which reaches skin surface, when 0.25 mmPb shielding is used. Also 1 cm or more air gap was needed to prevent the effect in 0.5 mmPb. If air gap was not concerned, 0.75 mm or more lead thickness was necessary to prevent effect of backscatter electron.

Keywords

backscatter electron;Shielded

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