title: Radiation effects in free-ranging pocket mice, Perognathus parvus, during the breeding season.
abstract: 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 (LD(50)) 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.
mesh_terms: D000818:Animals; D001947:Breeding; D002587:Cesium Isotopes; D004305:Dose-Response Relationship, Drug; D004777:Environment; D005260:Female; D008297:Male; D051379:Mice; D011830:Radiation Effects; D011833:Radiation Injuries, Experimental / Q000401:mortality; D012098:Reproduction; D012621:Seasons; D013045:Species Specificity; D013997:Time Factors
chemical_list: D002587:Cesium Isotopes