Simpkin D J, Mackie T R
Department of Radiology, St. Luke's Medical Center, Milwaukee, Wisconsin 53215.
Med Phys. 1990 Mar-Apr;17(2):179-86. doi: 10.1118/1.596565.
The EGS4 Monte Carlo code has been used to simulate the emission and energy deposition in H2O about point sources of monoenergetic electrons and radionuclides of potential use in radioimmunotherapy. The radiations studied were 0.05, 0.1, 0.5, 1.0, 2.0, and 3.0 MeV monoenergetic electrons and 32P, 67Cu, 90Y, 105Rh, 131I, 153Sm, 186Re, and 188Re beta particles and conversion and Auger electrons. Ten batches of 10,000 electrons (or 10,000 radionuclide decays) each were started isotropically at a point in an infinite homogeneous H2O phantom. The parameter-reduced electron-step transport algorithm (PRESTA) version of the EGS4 Monte Carlo code was used to follow these and their progeny, scoring the energy deposited in thin spherical shells. The scaled dose kernels are calculated and compared to kernels available in the literature. These previously published kernels either completely ignore secondary electrons or are based on a Monte Carlo code which improperly sampled the Landau energy straggling distribution.
EGS4蒙特卡罗代码已被用于模拟单能电子点源和放射免疫治疗中潜在使用的放射性核素在水中的发射和能量沉积。所研究的辐射包括0.05、0.1、0.5、1.0、2.0和3.0兆电子伏特的单能电子，以及32P、67Cu、90Y、105Rh、131I、153Sm、186Re和188Re的β粒子、转换电子和俄歇电子。每批10000个电子（或10000次放射性核素衰变）在无限均匀水模体中的一点各向同性地开始。使用EGS4蒙特卡罗代码的参数简化电子步传输算法（PRESTA）来跟踪这些电子及其后代，对薄球壳中沉积的能量进行评分。计算了缩放后的剂量核，并与文献中可用的核进行了比较。这些先前发表的核要么完全忽略二次电子，要么基于一个对朗道能量离散分布采样不当的蒙特卡罗代码。
