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Henry I. Kohn, Robert F. Kallman, Relative Biological Efficiency of 1000-Kvp and 250-Kvcp X-Rays: III. Determinations Based on the LD50/28 and the Killing Time of the Mouse, Radiation Research, Vol. 5, No. 6 (Dec., 1956), pp. 693-699
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Kohn et al. (1956) studied this question.
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