For a readable, in-depth analysis of radiation and the “Linear No-Threshold” (LNT) hypothesis my first recommendation is Barry Brook “Radiation – facts, fallacies and phobias“. Therein Barry includes a number of references.
One of the most concise resources that Barry linked has the same title “Radiation: Facts, fallacies and phobias” [PDF] by Prof David Wigg, a clinical radiobiologist at the University of Adelaide. This is a 5-page review article published in 2007 in the peer-reviewed journal Australasian Radiology.
I’ve written a couple of earlier posts on public health radiation risks, one of which Nuclear power scary radiation ends with a favorite quote from Prof. Gunnar Walinder, Chair of the Swedish Radiobiology Society:
“I do not hesitate to say that the LNT is the greatest scientific scandal of the 20th Century”.