Schell M C, Pearson D W, DeLuca P M, Haight R C
Cleveland Clinic Foundation, Department of Radiation Therapy, Ohio 44195.
Med Phys. 1990 Jan-Feb;17(1):1-9. doi: 10.1118/1.596523.
A detector has been developed and used to measure dose distributions versus linear energy transfer to thin gas targets in spherical geometry from fast neutron irradiation of tissue-equivalent plastic and carbon. The detector is a hemispherical proportional counter with a Cs(T1) scintillator at the center of the hemisphere. The coincidence of the proportional counter signals constrain the measurements to charged particles traversing the radius of the hemisphere. The charged particle energy deposition distributions are directly measured for a known pathlength. The A-150 kerma factor was measured at a neutron energy of 14.8 MeV and is in agreement with tabulated values. The carbon kerma factor measurements are less than the tabulated value at 14.8 MeV. The alpha-particle production in carbon was measured for neutron energies from 14.1 to 14.8 MeV and is compared with existing data.
已经开发出一种探测器，用于测量在球形几何结构中，组织等效塑料和碳受到快中子辐照时，剂量分布与向薄气体靶的线能量转移之间的关系。该探测器是一个半球形正比计数器，在半球中心有一个Cs(T1)闪烁体。正比计数器信号的符合情况将测量限制在穿过半球半径的带电粒子上。对于已知的路径长度，直接测量带电粒子的能量沉积分布。在14.8 MeV的中子能量下测量了A - 150比释动能因子，其与表格值一致。在14.8 MeV时，碳比释动能因子的测量值低于表格值。测量了14.1至14.8 MeV中子能量下碳中α粒子的产生情况，并与现有数据进行了比较。
