Revision 1
March 19, 1998
by Radiation, Science, and Health, Inc.,
Edited by J. Muckerheide

1.9
Conclusions

"Among about 100,000 A-bomb survivors registered at Nagasaki University School of Medicine, male subjects exposed to 31 - 40 cGy showed significantly lower mortality from non-cancerous diseases than age-matched unexposed males. And the death rate for exposed male and female was smaller than that for unexposed. It was presented that the low doses of A-bomb radiation increased lifespan of A-bomb survivors."

"The relative risk of death from all causes, cancer and non-cancer was analysed. For deaths from all causes, the relative risk did not show significant increase with dose. The relative risk of deaths from cancer increased with a dose threshold at about 50 cGy. However, for non-cancer deaths, the relative risk at 31 - 40 cGy range was below unit for male statistically significant (p<0.05)."

"It is clear that A-bomb radiation causes cancer in survivors dependent on radiation dose. The above data suggest that small doses of A-bomb radiation decreased death rate and relative risk and that increased lifespan of A-bomb survivors (Kondo 1993)."