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Abstract
The counting efficiencies obtained using anthropomorphic physical phantoms are generally used in whole-body counting measurements to determine the level of internal contamination in the body. Geometrical discrepancies between phantoms and measured individuals affect the counting efficiency, and thus, considering individual physical characteristics is crucial to improve the accuracy of activity estimates. In the present study, the counting efficiencies of whole-body counting measurements were calculated considering individual physical characteristics by employing Monte Carlo simulation for calibration. The NaI(Tl)-based stand-up and HPGe-based bed type commercial whole-body counters were used for calculating the counting efficiencies. The counting efficiencies were obtained from 19 computational phantoms representing various shapes and sizes of the measured individuals. The discrepancies in the counting efficiencies obtained using the computational and physical phantoms range from 2% to 33%, and the results indicate that the counting efficiency depends on the size of the measured individual. Taking into account the body size, the equations for estimating the counting efficiencies were derived from the relationship between the counting efficiencies and the body-build index of the subject. These equations can aid in minimizing the size dependency of the counting efficiency and provide more accurate measurements of internal contamination in whole-body counting measurements.

Virtual calibration 수행을 위해 그림과 같이 입식형, 침대형 전신계수기를 전산모사 모델링 후 인체전산팬텀을 적용하여 계측효율을 획득함.

Affiliations

Min Seok Park ab, Han Sung Kim a b, Jae ryong Yoo a, Chan Hyeong Kim b, Won Il Jang a, Sunhoo Park a

a
National Radiation Emergency Center, Korea Institute of Radiological and Medical Sciences, Seoul, 01812, Republic of Korea
b
Department of Nuclear Engineering, Hanyang University, Seoul, 04763, Republic of Korea