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1 From the Radiobiology Department, U. S. Army Medical Research Laboratory, Fort Knox, Kentucky
The ld50 values were determined for rats exposed to 100250 kvp x-rays for doses expressed in air and in tissue. Dose measurements were made in animal tissue. For the ld50 in tissue doses, the relative effectiveness was approximately one for all qualities. For the experimental conditions of the study, it seems that mid-line tissue dose may be the proper parameter for acute lethality in rats exposed to x-radiations having different depth dose distributions.
Submitted on November 28, 1957
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