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Abstract
Whole-body counters are widely used to assess internal contamination after a nuclear accident. However, it is difficult to determine radioiodine activity due to limitations in conventional calibration phantoms. Inhaled or ingested radioiodine is heterogeneously distributed in the human body, necessitating time-dependent biodistribution for the assessment of the internal contamination caused by the radioiodine intake. This study aims at calculating counting efficiencies considering the biodistribution of 131I in whole-body counting measurement. Monte Carlo simulations with computational human phantoms were performed to calculate the whole-body counting efficiency for a realistic radioiodine distribution after its intake. The biodistributions of 131I for different age groups were computed based on biokinetic models and applied to age- and gender-specific computational phantoms to estimate counting efficiency. After calculating the whole-body counting efficiencies, the efficiency correction factors were derived as the ratio of the counting efficiencies obtained by considering a heterogeneous biodistribution of 131I over time to those obtained using the BOMAB phantom assuming a homogeneous distribution. Based on the correction factors, the internal contamination caused by 131I can be assessed using whole-body counters. These correction factors can minimize the influence of the biodistribution of 131I in whole-body counting measurement and improve the accuracy of internal dose assessment.

전산모사 기반 교정을 위한 전신계수기에 대한 전산모사 모사 모델링: (a) stand-up type WBC, (b) bed type WBC

Affiliations

MinSeok Park a c, Jaeryong Yoo a,Minho 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 RI Application, Korea Institute of Radiological and Medical Sciences, Seoul, 01812, Republic of Korea
c
Department of Nuclear Engineering, Hanyang University, Seoul, 04763, Republic of Korea