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放射治疗学概论放射生物效应虽然应用放射线治疗恶性肿瘤已有多年的历史,但对其细胞杀伤的机理尚未完全搞清。所谓电离辐射即可为电磁性亦可为粒子性,其中 X 射线与 r 射线使有机体的原子或分子排出电子的机理不同于其它电磁辐射。存在三种主要的吸收方式:光电效应,康普敦效应和电子对生成。光子为一种低线性能量转化(LET),而粒子为一种高线性能量转化。电离作用可导致具有高度反应性
Introduction to Radiation Therapeutics Radiation Biological Effects Although radiotherapy has been used to treat malignant tumors for many years, the mechanism of cell killing has not been fully understood. The so-called ionizing radiation can be either electromagnetic or particle. The mechanism by which x-rays and r-rays cause the atoms or molecules of an organism to discharge electrons is different from other electromagnetic radiation. There are three main modes of absorption: the photoelectric effect, the Compton effect, and the generation of electron pairs. Photons are a low-linear energy transformation (LET), and particles are a highly linear energy transformation. Ionization can lead to high reactivity