New A-Bomb Study Affirms Low-Dose Risk

Email Print
FacebookTwitterShare

Recently by Ian Goddard: Fukushima Safety Level Is Not Safe

A landmark study of the survivors of the atomic bombings of Japan was just published. The study presents the strongest evidence to date that cancer risk not only exists at low doses of radiation, but may be even greater per unit of dose than at higher doses. The study also demonstrates that ionizing radiation is associated with non-cancer diseases involving circulatory, respiratory and digestive systems.

The new study corroborates the overall linear nature of the dose response to radiation, which means the risk of cancer increases uniformly as the dose of radiation increases. However, while this linearity holds over the whole dose range, the study reports emerging indications of non-linearity over smaller ranges wherein risk is higher per unit of dose. In my video we examine non-linearity in the A-bomb-survivor dose response in both the new and prior studies of the cohort.

Nagasaki, Hiroshima and combined dose response In the three A-bomb cohorts, linearity increases as cohort size increases, a strong indication that at least the overall dose response is linear.

In my video above we review prior studies of the A-bomb survivors to get a broader view of the unfolding research on this cohort. Perhaps most fascinating is a study from 2000 that published the dose-response graphs (seen above) for both Nagasaki and Hiroshima alone, as well as for both cities combined. What’s revealing is how we can see linearity in the dose response increasing as the size of the cohorts increases. This correlation between linearity and statistical power is a strong indication that the actual dose response is linear, at least over the whole dose range. But as in the new study, this prior study also shows a risk peak at the low end for both cities and their combination.

Email Print
FacebookTwitterShare