Calculation of absorbed energy in the gastrointestinal tract.
Calculation of absorbed energy in the gastrointestinal tract.
复制标题
计算胃肠道吸收的能量。
DOI：
10.1097/00004032-199609000-00005
复制
发表时间：
1996
期刊：
影响因子：
2.2
通讯作者：
J. Poston
中科院分区：
文献类型：
--
作者：
J. Poston;K. Kodimer;W. Bolch;J. Poston
这项研究的一个目标是使用他们的胃肠道(GI)模型重现克里斯蒂和埃克曼的光子特定吸收分数计算。第二个目标是使用电子跟踪技术为他们的胃肠道模型计算光子特定吸收分数值。最终目标是为他们的胃肠道模型计算电子吸收分数值。本文总结了使用Cristy和Eckerman提供的目前公认的胃肠道模型所进行的工作。他们的模型被编码到电子伽马簇射4(EGS4)计算包中，用于计算光子特定吸收分数值。为了对初始代码进行基准测试，运行了EGS4程序，以便所有次级粒子将它们的能量存放在初级光子相互作用的位置(即，没有电子跟踪)。将这些初步计算得到的结果与克里斯蒂和埃克曼提供的结果进行比较，以验证该计划并对其进行基准测试。接下来，利用EGS4的电子跟踪功能，计算了12个离散光子能量的特定吸收分数值。将这些光子比吸收分数值与没有电子跟踪的计算值进行了比较。最后，计算了12个离散电子能量的吸收分数。将电子吸收分数值与无电子跟踪的计算值进行了比较。最后，计算了12个离散电子能量的吸收分数。将电子吸收分数值与ICRP关于电子能量在胃肠道壁上沉积的“一半假设”进行了比较。
One goal of this research was to reproduce the photon specific absorbed fraction calculations of Cristy and Eckerman using their gastrointestinal (GI) tract model. A second goal was to calculate photon specific absorbed fraction values for their GI tract model using electron tracking techniques. A final goal was to calculate electron absorbed fraction values for their GI tract model. This paper summarizes the work performed using the currently accepted model of the GI tract provided by Cristy and Eckerman. Their model was coded into the Electron Gamma Shower 4 (EGS4) computational package for calculation of photon specific absorbed fraction values. To benchmark the initial code, the EGS4 program was run so that all secondary particles deposited their energy at the site of the primary photon interaction (i.e., without electron tracking). The results obtained from these preliminary calculations were compared to those provided by Cristy and Eckerman to verify and benchmark the program. Next, specific absorbed fraction values were calculated for twelve discrete photon energies using the electron tracking capabilities of EGS4. These photon specific absorbed fraction values were compared to those calculated without electron tracking. Finally, absorbed fraction values were calculated for twelve discrete electron energies. The electron absorbed fraction values were compared to those calculated without electron tracking. Finally, absorbed fraction values were calculated for twelve discrete electron energies. The electron absorbed fraction values were compared to the ICRP "one-half assumption" for electron energy deposition in the wall of the GI tract.