Fear of radiation

© Image: Robert Hargraves, PhD
Fig.1 Exposures up to 100mSv in a short time won't overwhelm our immune systems.

Fig.2 People living in areas with high background radiation don't have more cancer.

Fear of radiation is one of the barriers to reconsidering nuclear power. Government agencies have for decades assumed that deaths and other bad effects of radiation on our health follow a model called Linear No Threshold (LNT), in which death and disease is directly proportional to the total cumulative radiation, no matter how low the rate, even as low as the normal background radiation from space and the materials around us. This assumption ignores the data on low exposures (Figs.1&2) and the role of DNA repair in mitigating the damage done by low doses of radiation (Fig.3). Without a repair mechanism, the number of DNA breaks would simply accumulate in a linear fashion, no matter how low the exposure.

© Image: Robert Hargraves, PhD
Fig.3 Natural breakage and repair of our DNA occurs much faster than damage from low levels of radiation.

Fig.4 Eliminating small amounts of radon can be costly.

Over reliance on the LNT model has led to policies that are very costly, like radon remediation in old homes (Fig.4) and over-reaction to radiation accidents, like the evacuation after Fukushima (Fig.5), which caused far more deaths that the accident itself (Fig.6). It has also led to excessive fear of radiation from medical x-rays and other nuclear medicine procedures which save thousands of lives.

Fig.5 Evacuation following the Fukushima meltdown.

Fig.6 Fukushima death toll over seven years, mostly from bad politics, none from radiation.

The LNT model has also been used to argue against expansion of nuclear power. It has lead to the belief that an accident causing a small increase in radiation over a very large area could lead to a large number of cancers and deaths. A more realistic assessment will show that the danger from nuclear power is much smaller than the public believes, and much smaller that the risks from ever-increasing CO2 in our atmosphere.

Further Reading

For a more complete discussion of radiation fear, its effect on public policy, and how radiation damage to our DNA is actually repaired, see Section 6 of ElectrifyingOurWorld.com by Robert Hargraves, a founder of ThorCon.

For the pro-LNT point of view, see Hold Fast to Linear No-Threshold for Radiation Protection, Bemnet Alemayehu, Natural Resources Defense Council, 2016.

For a review of the history of the LNT controversy, see The Two Lies that Killed Nuclear Power, Jack Devanney, Principle Engineer, ThorCon USA, 2022. and Devanney's book Why Nuclear Power Has Been A Flop, which has more detail and references to reliable sources.

For a proposal to replace LNT with SNT, a more accurate model of the harm caused by radiation exposure, see Jack Devanney's SNT for Dummies

For a review of the data underlying the LNT controversy, see Risk of low-dose radiation and the BEIR VII report: A critical review of what it does and doesn’t say.

For the latest and most thorough review, see the UNSCEAR 2019 Report from the United Nations Scientific Committee on the Effects of Atomic Radiation.