视等时年龄 apparent isochron age
等时线年龄测定 isochron dating
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其辐射风险不仅与剂量有关，还与受照射时年龄、照后经过时间和到达年龄等因素有关。
Cancer risk is relatived not only with dose, but also with age at exposure, time since exposure, attained age and some other factors.
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