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.

使用拟人物理模型获得的计数效率通常用于全身计数测量，以确定体内的内部污染水平。体模和测量个体之间的几何差异会影响计数效率，因此，考虑个体的身体特征对于提高活动估计的准确性至关重要。在本研究中，通过采用蒙特卡罗模拟进行校准，计算全身计数测量的计数效率，考虑到个体的物理特征。基于 NaI(Tl) 的立式和基于 HPGe 的床型商用全身计数器用于计算计数效率。计数效率是从代表被测个体的各种形状和大小的 19 个计算模型中获得的。使用计算和物理模型获得的计数效率的差异范围为 2% 到 33%，结果表明计数效率取决于被测个体的大小。考虑到体型，估计计数效率的方程是从计数效率与受试者体型指数之间的关系中推导出来的。这些方程可以帮助最小化计数效率的大小依赖性，并在全身计数测量中提供更准确的内部污染测量。使用计算和物理模型获得的计数效率的差异范围为 2% 到 33%，结果表明计数效率取决于被测个体的大小。考虑到体型，估计计数效率的方程是从计数效率与受试者体型指数之间的关系推导出来的。这些方程可以帮助最小化计数效率的大小依赖性，并在全身计数测量中提供更准确的内部污染测量。使用计算和物理模型获得的计数效率的差异在 2% 到 33% 之间，结果表明计数效率取决于被测个体的大小。考虑到体型，估计计数效率的方程是从计数效率与受试者体型指数之间的关系推导出来的。这些方程可以帮助最小化计数效率的大小依赖性，并在全身计数测量中提供更准确的内部污染测量。估计计数效率的方程式是根据计数效率与受试者体型指数之间的关系推导出来的。这些方程可以帮助最小化计数效率的大小依赖性，并在全身计数测量中提供更准确的内部污染测量。估计计数效率的方程式是根据计数效率与受试者的体格指数之间的关系推导出来的。这些方程可以帮助最小化计数效率的大小依赖性，并在全身计数测量中提供更准确的内部污染测量。