Mowlavi Ali Asghar, Fornasier Maria Rossa, Mirzaei Mohammd, Bregant Paola, de Denaro Mario
Physics Department, Hakim Sabzevari University, Sabzevar, Iran,
Ann Nucl Med. 2014 Oct;28(8):824-8. doi: 10.1007/s12149-014-0852-7. Epub 2014 Apr 29.
The beta and gamma absorbed fractions in organs and tissues are the important key factors of radionuclide internal dosimetry based on Medical Internal Radiation Dose (MIRD) approach.
The aim of this study is to find suitable analytical functions for beta and gamma absorbed fractions in spherical and ellipsoidal volumes with a uniform distribution of iodine-131 radionuclide.
MCNPX code has been used to calculate the energy absorption from beta and gamma rays of iodine-131 uniformly distributed inside different ellipsoids and spheres, and then the absorbed fractions have been evaluated.
We have found the fit parameters of a suitable analytical function for the beta absorbed fraction, depending on a generalized radius for ellipsoid based on the radius of sphere, and a linear fit function for the gamma absorbed fraction.
The analytical functions that we obtained from fitting process in Monte Carlo data can be used for obtaining the absorbed fractions of iodine-131 beta and gamma rays for any volume of the thyroid lobe. Moreover, our results for the spheres are in good agreement with the results of MIRD and other scientific literatures.
基于医学内照射剂量（MIRD）方法，器官和组织中的β和γ吸收分数是放射性核素内照射剂量学的重要关键因素。
本研究旨在为碘-131放射性核素均匀分布的球形和椭球体积中的β和γ吸收分数找到合适的分析函数。
使用MCNPX代码计算碘-131均匀分布在不同椭球体和球体内的β和γ射线的能量吸收，然后评估吸收分数。
我们找到了一个适合β吸收分数的分析函数的拟合参数，该参数取决于基于球体半径的椭球体广义半径，以及γ吸收分数的线性拟合函数。
我们从蒙特卡罗数据拟合过程中获得的分析函数可用于获取任何甲状腺叶体积中碘-131β和γ射线的吸收分数。此外，我们对球体的结果与MIRD和其他科学文献的结果高度一致。
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