od 1953 the following recommendation was made, "It is recommended, and found to be in conforaity witn the present “ principles of determining perwissiile excosure linits, that for test operatioa persomel the total [ody gacma exposure te linited to 3.9r in tirteen weeks, and trat te same Migure te aprlied to the off-site com monities wit: tre furt er qualification in t.e latter case that tis is tre total figure for t.e year, sorties in ary given year.* In general, tis imlies a single test On the hasis of tis recomme:dation ard t.e reasoning discussed uncer Policy I, toe eriteria for estimating t:e wole -ody gaa effective clolopical dose are summarised in Ta‘le ¥, It will te noted t.at tie (iological factor included under Policy I 4a omitted in Palicy ¥. In the first case we are Gealing with relatively “ig: dosea that may require emergency measures Wit) t.eir attendant hazards, It is @ situation where one wishes to estimate all pertinent factors in evaluating radietio: doses even thour.. te; may not be known wit. precilsences, ‘efore recommending an emergency action that may produce greater pro’lens, In the case of Policy Y one is concerned wit: relatively lower doses during routing operations, . It would :e@ diffierl: to justify on the one baad the propos’ tion that weekly doses for ge.eral populations may te integreted and taxes in @ single exposure without pe:mlty sad on ne ot°er hand that a elven dose received over a period of a year may be administpatively reduced because of tiological repeir, factor is oni tted, ‘T.erefore, the tdolocical