抄録
Ques-tionnaires were sent to 1, 005 radiological technicians of ages over 60 years in order to know the frequency of sterility including infertility. Of these, 418 responded and 393 (39.1%) were usable for analysis. In 110 (28.0%), their wives had no childbirth in the first three years of marital life, and 33 (8.4%) have never had childbirth until 60 years of age. These rates of sterility are signifi-cantly higher than those of the general population in Japan in 1951. In persons who married before 1930 and are considered to have been exposed to radiation more than 400 R/year, absolute sterility tended to occur more frequently.
