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放射治疗学是用电离辐射治疗肿瘤的事业。目前约有20%的肿瘤病人接受放疗,将来到2000年,虽然生物工程学可能揭露正常组织癌变的机理,但也将使用更有效地杀死癌细胞的高能离子来治疗肿瘤,电离辐射不仅杀灭癌细胞,它也伤害正常组织。使用不当,不仅不能控制癌肿,并且要发生难以痊愈的放疗炎症,因此掌握辐射剂量是放疗成败的关键。用于放疗的辐射剂量学称放疗剂量学。
Radiotherapy is the use of ionizing radiation to treat cancer. About 20% of cancer patients currently receive radiotherapy. By the year 2000, although bioengineering may unmask the mechanisms of canceration in normal tissues, it will also treat tumors using more energetic ions that more effectively kill cancer cells. Ionizing radiation not only kills Eliminate cancer cells, it also injures normal tissues. Improper use, not only can not control the cancer, and the occurrence of refractory radiotherapy inflammation, so to master the radiation dose is the key to success or failure of radiotherapy. Radiation dosimetry for radiotherapy is called radiotherapy dosimetry.