tw — _ states "It appears, then, that strontiim 30 is not a’ current thecat, tos Lf there weve ovo cubltur av seme el inersece in the vir: of contamination of the atmosphere, it could become one." _~ The conclusions are to all intents and purposes identical to those of the National Academy off Sciences report, 1, Adequate justification should be required for the employment of any source of tonizing radiation on however small a scale, This is not explicitly stated in the National Academy of Sciences report but is inherent in i#, 2,Dose lévels to the individual - 0,3r per week ~ 200p in a lifetime for occupational exposures and no more than 50r the first 30 years of life. : oo. 3.No more than twice natural background from man made sources for the ‘population as a whole, ee oS 4, The present and foreseeable hazards from external radiation due to fallout at present rate of testing 118 insignificant, As to internal hazards from strontium ; - , firing increases and particulerly if greater numbers of thermonuclear weapons are used, we could within the life- ct we cannot ignore the possibility, that if the rate of oe at its present level no detectatle increase in the incidence of ill-effects is to be expected, "Nevertheless, ° recognizing all the inadequacy of our present kncwledze, * time of some now living, be approaching levels at which All-effects might be produced in a small number of the population," This is a rather roundabout way of saying, ‘let's be careful," 5, a, All sources of radiation should be under close inspection, A personal record not only of doses of radiation received during occupation but also of exposure from all other sources such as medical diagnostic radiology should be kept for e11 persens yhose occupation exposes them to additional sources of radiation, The National Academy of Sciences report would seem to include the whole population in its similar recommendations, * b. Present practices in metical diagnostic radiology should be reviewed with the c ject of clarifying the indications for different special types of exemination now being carried out and defining more closely, toth in relation to the patiant and to the operators, tne conditions which should be obcerved in their perfcrmencs, This S2yss in effect, “let's ishten up on unnececcery exposures." . - A \ ” me-malignant ccne, The uses of redictherap: in ami wod--again, a ditions should be critically "stem Werning to tisnten up on unmne ‘5 cary exposures,

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