The duration of the loss of righting reflex (sleeping time) was determined after intraperitoneal administration of 100 mg/kg hexobarbital to adult male Sprague-Dawley rats that were exposed to60 Co γ radiation or sham irradiated. No difference between irradiated and control animals was detected at 1, 3, 5, and 7 days after 850 R. Also, no difference between irradiated and control animals was detected at 5 days after 1000 or 1400 R.

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