C , TABLE I ( FRC RADIATION PROTECTION Guipes 1/ Whole body Gonads : | Individual Population Group 0.5 rem/yr 0.17 rem/yr - . 5 rems /30 yrs Thyroid 2/ 1.5 rems/yr 0.5 rem/yr Bone marrow 0.5 rem/yr 0.17 rem/yr Bone 1.5 rems/yr 0.5 ren/yr Bone (alternate 3/ 0.003 pg of 0.001 pg of skeleton skeleton guide) 226pa in adult 226Ra in adult 1/ For conditions and qualifications see FRC Report Nos. 1 and 2. 2/ Based upon a childs thyroid, 2 gms in weight and other factors listed in paragraphs 2.10-2.14 of FRC Report No. 2. 3/ Or the biological equivalents of these amounts o £ 226pa,