Abstract
We compared cancer mortality between two groups of Nagasaki A-bomb survivors; one group was bombed in area shielded by Mt. Kompira(366 meter-high) and Mt. Gosha(285 meter-high) located east and east-south at about 2.5 km from the hypocenter, respectively, while the other was bombed in unshielded area in the south at a similar distance from the hypocenter. Cancer mortality during 1970-2001 in 2345 survivors bombed in the unshielded area was 1.51-fold (95%CI: 1.20-1.89) higher than that in 2340 bombed in the shielded area after adjustment for sex, age, distance and shielding. The results suggest that the survivors bombed in the shielded area were less irradiated than those bombed in the unshielded area. [J Radiat Res 44:387 (2003)]
