. wt ae te: “ons ‘" - a ee ssyet a Wiaaiee Sipe te -, oe Sqlementsjseperately or simultaneously, these in ’ “tun being uniformly distributed or preferentially deposited in the same or differant. parte of tho body; in short the oumulative effect of several elements superimposed upon the cumulative effeot of differing body locations d. Application of these definitions, together with those for external effeota, to cnloulate the cumulative internel-external dosages for one or several kinds of radioactivity affecting one or several parts of the body, simultaneously and cunnlatively B. The assumptions and models bohind the establishment of standard limits of exposure and/or dosage and/or bodyburdonr: 1. The historical trend of the standards and future trenis 2. The validity of the assumptions now used in the lipht of up-to-date knowledge 3. JCAE The probable trend of standards for the future a, Will any new standarde have to be defined and given a value because certain kinds of danage area not now adequately protected against o Can the varfous standards now in existence be renked in such a way that the most severe always covers ths next most severe? In other worda, ir there any ambiguity as among the various standards an to which apply? © .

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