... 25, 000Breast 0. 15 2 .5 x 10 -5 1 in 40,000Red bone marrow 0.12 2 x 10 -5 1 in 50 ,000Lung 0.12 2 x 10 -5 1 in 50 ,000Thyroid 0.03 5 x 10 -6 1 in 200,000Bone surfaces 0.03 5 x 10 -6 1 in 200,000 ... each of Table 5. 5 Definitions: Weighting Risk CoefficientWeighting Factor Risk Coefficient ProbabilityOrgan or Tissue (WT) (per rem) (per rem)Gonads 0. 25 4 x 10 -5 1 in 25, 000Breast 0. 15 ... Elbows, Legs Below Knees! 15 rems per year (0. 15 Sv year) to lens of eye, and! A shallow dose equivalent (at a tissue depth of 0.007 cm over a 1 cm2 area) of 50 rems(0 .5 Sv) to the skin and any...