Table 1.

Cell rate of semen and chromosome aberration at different times after irradiation.

	18 months	24 months	26 months	5 years	10 years	20 years	34 years
Sperm count (10,000/ml)	0	0–0.0001	4,600	8,400	7,600	6,800	7,100
Chromosome aberration†	7.33			5.5	0.5	0.5	0
Cell rate (%)
Total chromosome†	7.66			6.0	1.0	0.5	0
Aberration cell rate (%)

^†chromosome aberration tests were not performed at 24 and 26 months after the exposure.