Determination of counting efficiency considering the biodistribution of 131I activity in the whole-body counting measurement

• Published in: Nuclear engineering and technology Vol. 55; no. 1; pp. 295 - 303
• Main Authors: Park, MinSeok, Yoo, Jaeryong, Kim, Minho, Jang, Won Il, Park, Sunhoo
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.01.2023; Elsevier; 한국원자력학회
• Subjects: Computational phantom; Counting efficiency; Monte Carlo simulation; Radioiodine; Whole-body counter; 원자력공학; Computational phantom; Radioiodine; Whole-body counter; Counting efficiency; Monte Carlo simulation
• ISSN: 1738-5733; 2234-358X
• DOI: 10.1016/j.net.2022.09.013

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.