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首页> 美国卫生研究院文献>Journal of Radiation Research >Internal exposure rate conversion coefficients and absorbed fractions of mouse for 137Cs 134Cs and 90Sr contamination in body
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Internal exposure rate conversion coefficients and absorbed fractions of mouse for 137Cs 134Cs and 90Sr contamination in body

机译：内部曝光速率转化系数和小鼠的吸收分数为137℃134℃和90sr污染体内

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The aim of this study was to determine parameters for estimating the internal exposure of all organs in mouse experiments from the radioactivity concentration in organs. The estimation of internal exposure rate conversion coefficients and absorbed fractions for 137Cs, 134Cs and 90Sr by the Particle and Heavy Ion Transport code System (PHITS) with a voxel-based mouse phantom is presented. The geometry of the voxel phantom is constructed from computer tomography images of a mouse 9 cm in length weighing 23.9 g. The voxel-based mouse phantom has the following organs: brain, skull, heart, lungs, liver, stomach, spleen, kidneys, bladder, testis and tissue (tissue and other organs). Gamma- and beta-rays from 137Cs, 134Cs and 90Sr sources in each source organ are generated and scored for every target organ. The internal exposure rate conversion coefficients and absorbed fractions are calculated from deposition energies in each target organ from each source organ and are used to generate an internal exposure rate conversion coefficient matrix and an absorbed fraction matrix. The absorbed fractions of beta-rays in the source organs are roughly 0.5–0.8 for 137Cs and 134Cs, and the absorbed fractions of gamma-rays are <0.04 for 137Cs and <0.03 for 134Cs. The internal exposure rate conversion coefficient matrix is defined using the absorbed fractions. The calculated internal exposure rate coefficient matrix is tested under a uniform radioactivity concentration of 1 Bq/kg for 137Cs, 134Cs and 90Sr. The estimated internal exposure rates in the mouse whole body for 137Cs, 134Cs and 90Sr are 3.28 × 10−3, 2.55 × 10−3 and 1.20 × 10−2 μGy/d, respectively. These values are very similar to those for an ellipsoid frog (31.4 g) and an ellipsoid crab egg mass (12.6 g) reported in ICRP Publication 108.
机译：本研究的目的是确定从在器官中的放射性浓度推定所有器官的在小鼠实验中，内部的曝光参数。内部曝光速率转换系数和铯-137，134Cs和90Sr的吸收馏分由粒子和重离子运输代码系统（PHITS）与基于体素的小鼠体模的估计被呈现。体素体模的几何形状是从长度称重23.9克鼠标9厘米的计算机断层摄影图像构成。基于体素的小鼠体模具有以下器官：脑，头骨，心脏，肺，肝，胃，脾，肾，膀胱，睾丸和组织（组织和其他器官）。 γ-和从铯-137的β-射线，134Cs和90Sr的每个源器官来源产生，并取得每一个靶器官。内部暴露率转换系数和吸收的级分从沉积能量在从每个源器官每个靶器官计算并且被用于产生一个内部曝光速率变换系数矩阵和被吸收分数矩阵。的β射线源器官吸收馏分大致为0.5-0.8铯-137和134Cs，和γ射线的吸收分数为<0.04铯-137和<0.03为134Cs。内部曝光速率变换系数矩阵被定义使用所吸收的级分。所计算的内部暴露率系数矩阵1贝克/千克的均匀放射性浓度为铯-137，134Cs和90锶下进行测试。在小鼠全身为铯-137，134Cs和90Sr的所估计的内部暴露率是3.28×10-3，2.55×10-3和1.20×10-2μGy/ d，分别。这些值非常相似对于椭圆蛙（31.4克）和在ICRP公开报告108的椭圆蟹卵块（12.6克）。

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