statistically insignificant Hiroshima radiation Nagasaki birth defects hypocenter Kure National Academy of Sciences
While the National Academy of Sciences raised the possibility that Neel's procedure did not filter the Kure population for possible radiation exposure which could bias the results, overall, a statistically insignificant increase in birth defects occurred directly after the bombings of Nagasaki and Hiroshima when the cities were taken as wholes, in terms of distance from the hypocenters.