Methods Blood samples were collected from patients exposed to radiation at the accumulated dose of 0, 4, 10, 28, 48 Gy and 68 Gy for the comet assay and determination of DNA damage and hprt gene mutation, respectively.

• 方法 在病人接受放射治疗累积剂量为 0、4、10、2 8、48Gy和 68Gy时 ,取病人外周血淋巴细胞分别进行彗星试验 ,淋巴细胞DNA的损伤及hprt基因突变检测。