ro ee ae - t nent - Criteria ° Table Ia summarizes the radiological criteria to be used in evalvating the feasibility of evacuition. RADICLOGICAL CRITERIA FOR EVALUATING FEASIBILITY CPF EVACUATION Effective Biological Dose* Calculated To Be Delivered Minimum Effective Biological Dose That Must Be Saved By Act Of Lowine Pellet Will Not. Pe Indicated) Up to 30 roentgens {No evacuation indicated) 30 to 50 roentgens 15 roentgens In A One-Year Feriod Fol- Evacuation (Otherwise Evacuation 50 roenitgens and higher (Evacuction indicated without regard to quantity of dose that might be saved) eC *The "effective biological dose" is an estimate of a biolosicel "damage" dose, taking into account the lin th ef time for delivery of a given dose, and ths recuction ef esse due to (a) shielding a wees ee afforded by buildines and (b) the process of weathering. The rationale for teble Ja is as follows: The total effective tie ological dose that would be received if evacusiion were not ordered is obviously a determinins factor, Another consiceration is the fact t!.at such en action as evacuation could be dangerous to the individuals end could also possibly be cetrimental to a very necessary nations) effort of weapons development. One mst then ask, "Just how much will be gained (radiation dose saved) by evacuation?" are indicated in table Ia. Estimates of these two variables Thus, a populace may receive up to a calcu- lated 30 roentgen effective biological dose in one year without indicat~ing evacuation; from 30 to 50 roentgens, evacuation would be considered 4 ote TARLETe