Figure 1.

Results from mouse experiments. The irradiated group represents B6C3F1 female mice exposed to chronic radiation for 400 days (total dose: 8 Gy). (a) Survival curve.⁶ (b) Deceased fraction resulting from all neoplasms.⁷ (c) Mortality calculated from the survival curve. The solid lines with solid squares (■) represent the control group, and the dashed lines with open squares (□) represent the exposed group. The dashed line represents a shift of the control curve toward a lower age by 100 days. (d) Temporal changes of the RR which were calculated from the ratio of the two mortality curves in C (see the Supplementary Material 1 for the derivation). RR, relative risk.