tfonated doses. Cf coursse, fat Caily radiation coses received from a Sh ame ke out are not equally fractionated so that the ratio would be in the direction of unity. Day-by-day doses delivered from fallout from the 15th dey to one year are more nearly equivalent than at early tines (ignoring the weathering factor). Strandgvist data do not extend beyond 40 days and it is quest jonable to extrapolate his datain tn ‘ ara, Pp RRR a attempt to derive a similar ratio as above based on one year, since affecting the rate of dose delivery, etc. ? other uncertainties are so great, i.e., effects of weathering as The ratio would presum- ably be farther from unity then for a 15-day period relatively rapidly repeal red orsan end thus may tend to overeery: asize the effects of fractionation when considering whole=bedy gsita a VGaes Cronkite reports** "In the dog, with cobalt gamma rays, the ¢ 50 percent of the dogs in a thirty-day rina fingle doce at roughly 15 r per mir 275 r, After Dhis douse of reaiation th Within « pericd or 7 to 10 days and deat €ignth and twenty-fifth cay. Henorrhaz:. | . ot profound anemis ere prevalent. If the °< 10U r per Gay given over a fourteen-her dose is insreas2d to 600-900 r. Unier } moet ty animals die in approxirately tne sam identical manifestations. If the exrosr per cay given over a fourteen-hour perithen increased to well over 1200 r, ana findings are chanzed," Qne problem in such experiments is the eval: that the animals may be virtually dead while the . “~ tinued. This might be illustrated in experiments where the daily doses of 400, 200 and 100 roent:: separate groups required 3600 to 4000, 2800 to 3: *See Addendum, page 28, **Medical Aspects of Radiolocical Defense, Cronk? to Federal Civil Defense Administration, Regicr.: Northeastern States of Radiological and Chemica’ City, October 22, 1953. that wili kill ; when delivered a oid de peek LOTUS 5 oF time vith Cropped ta 25 r > lethel cose i 5 waaptons end 1 Of poss ilility oyures are consing the burro piven to three and 2000 to E. P. Lecture “onference of iense, New York