Nelson W R, LaRiviere P D
Health Phys. 1984 Dec;47(6):811-8. doi: 10.1097/00004032-198412000-00001.
Primary and leakage x-ray spectra for typical clinical accelerators have been calculated using the EGS Monte Carlo code for 3 energies (6, 10 and 25 MeV) and 4 angles (0 degree, 45 degrees, 90 degrees and 135 degrees). Broad-beam transmission curves have been calculated for ordinary concrete using the MORSE program with the EGS spectra as input. A simple analytical model, which is shown to agree rather well with both experimental data and with the MORSE results, is presented and initial and subsequent tenth-value layers are extracted. Finally, the photon spectrum after the concrete shield is obtained with MORSE.
已使用EGS蒙特卡罗代码针对3种能量（6、10和25兆电子伏特）和4个角度（0度、45度、90度和135度）计算了典型临床加速器的初级和泄漏X射线光谱。已使用MORSE程序并以EGS光谱作为输入来计算普通混凝土的宽束传输曲线。提出了一个简单的分析模型，该模型与实验数据和MORSE结果都相当吻合，并提取了初始和后续的十分之一值层。最后，使用MORSE获得混凝土屏蔽后的光子光谱。
