Radiation Effects in Free-Ranging Pocket Mice, Perognathus parvus, during the Breeding Season

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Science  19 Jan 1973:
Vol. 179, Issue 4070, pp. 289-291
DOI: 10.1126/science.179.4070.289


Captive and free-ranging Great Basin pocket mice, Perognathus parvus, were exposed to ionizing radiation during the breeding season, April-June, in 1971. The values for the median lethal dose (LD50) at 30 days plus or minus the standard deviation were 880 ± 14 rads and 780 ± 27 rads, respectively, and the slopes of the survivorship curves were significantly different. These differences suggested that there was a synergism between radiation-induced and environmental sources of mortality, since the field data were corrected for natural mortality (5 percent) in the controls.