Researchers with the U.S. Department of Energy (DOE)'s Lawrence Berkeley National Laboratory (Berkeley Lab), through a combination of time-lapse live imaging and mathematical modeling of a special line of human breast cells, have found evidence to suggest that for low dose levels of ionizing radiation, cancer risks may not be directly proportional to dose. This contradicts the standard model for predicting biological damage from ionizing radiation - the linear-no-threshold hypothesis or LNT - which holds that risk is directly proportional to dose at all levels of irradiation.

"Our data show that at lower doses of ionizing radiation, DNA repair mechanisms work much better than at higher doses," says Mina Bissell, a world-renowned breast cancer researcher with Berkeley Lab's Life Sciences Division. "This non-linear DNA damage response casts doubt on the general assumption that any amount of ionizing radiation is harmful and additive."
[link to medicalxpress.com]

If you take this new finding into consideration, higher doses of ionizing radiation actually help DNA repair but large doses can cause much damage and with every repair, their is a chance that something goes wrong and the process is somehow disrupted and causes cancer.

Are there people out there who are trying to use cancer to become immortal? Sounds like a bad hollywood movie.