小剂量电离辐射过去一直被广泛认为会产生与大剂量电离辐射类似的效应。然而，近年来有文献报道小剂量电离辐射（包括小剂量照射）可减少和抑制肿瘤生长。另有资料表明［１］，高本底地区肺癌和肝癌发生率显著低于对照地区。然而小剂量电离辐射对肿瘤转移的影响在国内报道... Low-dose ionizing radiation has been widely considered in the past to produce effects similar to those of high-dose ionizing radiation. However, in recent years there have been reports in the literature that low-dose ionizing radiation (including low-dose radiation) can reduce and inhibit tumor growth. Another data showed that [1], the incidence of lung cancer and liver cancer in the high background area was significantly lower than the control area. However, the impact of low-dose ionizing radiation on tumor metastasis has been reported in China...