Survey, Cleanup and Rehabilitation Evaluation It is recommended in this context that: Ll. A limit of 50 percent of the ICRP dose limits for yoyo Che cause offlu Small,Apaletow Sige anf thy pla raced vudrind ancl é Mite u * ndLig t be used. This assumes, that the range of annual exposure levels for persons receiving the higher exposures will be known. The following values apply: Gonads, red bone marrow Skin, bone, thyroid Hand, and forearms; feet and ankles Other single organs 2. 0.25 rem/yr 1.50 rem/yr (0.75 rem/yr, childrens thyroid) 3.75 rem/yr 0.75 rem/yr_ A limit for gonadal exposure of the population be 5 rems in 30 years. This is based on the genetic dose coming primarily from Hi, tbpia 137cesium, x ame’ radiological half-life of whicheis-30 ¥ years.