Polig E
Radiat Environ Biophys. 1983;22(3):163-75. doi: 10.1007/BF01323706.
Spectra of specific energy f(z) in spherical and disc-shaped targets are determined for plane sources of alpha-particles. The radioactive plane is assumed to be coincident with bone surfaces or 'buried' within bone. Parameters determining energy straggling and the spectrum of delta-rays generated outside the target were determined from published parallel beam experiments with wall-less counters. An analytical procedure for calculating single and multiple event spectra for the sphere is demonstrated. For discs spectra are derived from Monte-Carlo calculations. In discs of 6.5 micrometers radius and 1 micrometer thickness adjacent to bone surfaces the mean specific energy per event is 2967 erg/g, while tht in a sphere of equal volume is 5247 erg/g. The relative variation of specific energy in the disc is about twice as large as in the sphere.
针对α粒子平面源，确定了球形和盘形靶中比能f(z)的能谱。假定放射性平面与骨表面重合或“埋于”骨内。根据已发表的使用无壁计数器的平行束实验，确定了决定能量离散以及在靶外产生的δ射线能谱的参数。展示了一种计算球体单事件和多事件能谱的分析程序。对于盘形，能谱由蒙特卡罗计算得出。在半径为6.5微米、厚度为1微米且与骨表面相邻的盘中，每个事件的平均比能为2967尔格/克，而在等体积球体中的平均比能为5247尔格/克。盘中比能的相对变化约为球体中的两倍。
