Abstract
There was no significant difference between the responses of captive and free-ranging Great Basin pocket mice, Perognathus parvus, to ionizing radiation. The ${\rm LD}_{50(30)}\pm {\rm SD}$ values were 858 ± 27 rad and 834 ± 32 rad, respectively, and the slopes of both survival curves were parallel. Although some unconfined mice lived 3 years postirradiation, the median longevity was 12 months or less for all dose levels. Median longevity appeared to be inversely related to absorbed dose above the threshold exposure: 675 rad. Radiation-induced sterility was not evident in free-ranging males, but all irradiated females appeared to be permanently sterile in subsequent breeding seasons. Pocket mice were able to survive secondary effects including: swelling and eversion of cheek pockets; depilation; and a change in coat color from tan to white.
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