Table 2: Variation in relative risk due to ionizing radiation (from the Atomic Bomb Survivors Study)¹⁶.

Age At Exposure	Excess Relative Risk of Breast Cancer per Sv Exposure
< 10 Years	2.41 (1.63 – 3.44)
10 – 29 Years	1.25 (0.77 – 1.87)
30 – 50 Years	0.48 (0.002 – 1.28)