This study evaluated the effects of γ radiation on spermatozoa based on the morphological characteristics of
sperm in the caudal epididymis of SWR/J mice. In this study, various abnormal sperm shapes (amorphous heads, hook-less,
mid-piece defect, pinheads, coiled tails, and tail-less) were observed after exposure to γirradiation (2 or 4 Gy)and after
treatment with aspirin (ASA) and γ-irradiation (0.5 mg/kg + 2 or 4 Gy, 5 mg/kg + 2 or 4 Gy and 50 mg/kg + 2 or 4 Gy).