Radiation hormesis

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Low-Dose Radiation Can Enhance Natural Barriers to Cancer, according to the Journal of American Physicians and Surgeons Association of American Physicians and Surgeons (AAPS); CISION PR newswire; 15 Dec 2017

High-dose ionizing radiation is known to reduce the body's resistance to cancer, but low-dose radiation actually enhances natural defenses, writes Bobby R. Scott, Ph.D., in the winter issue of the Journal of American Physicians and Surgeons. This means that the widely believed statement that "there is no safe dose of radiation" is not true.
Scott, a scientist emeritus at the Lovelace Respiratory Research Institute in Albuquerque, N.M., points out in this review that natural background radiation is estimated to have been five-fold higher in earlier eras, and mammals likely survived because of enhanced natural cancer barriers.

Small Radiation Doses Enhance Natural Barriers to Cancer Bobby R. Scott, Ph.D; Journal of American Physicians and Surgeons; Winter 2017

Natural barriers to cancer exist at the molecular, cellular, tissue, organ, and whole-body levels. The cancer barriers are diminished by high radiation doses, facilitating cancer occurrence. In contrast, low radiation doses enhance these cancer barriers, which can lead to threshold and hormetic doseresponse relationships for cancer induction. These facts render the linear-no-threshold (LNT) model for cancer induction implausible.
In earlier eras in geologic time, the level of natural background radiation is estimated to have been about five-fold larger than in recent times.
Mammals likely could not have survived in this harsher radiation environment without the ability to enhance natural protection (barriers) against cancer and other life-threatening diseases.