Tiny worms living in the radioactive Chernobyl Exclusion Zone (CEZ) surprisingly show no signs of radiation damage in their genes. Researchers compared the worms’ genomes to those from non- irradiated areas and found no mutations caused by radiation.
This doesn’t mean the zone is safe, but suggests these worms have remarkable resilience to radiation. Studying these worms might provide insights into DNA repair mechanisms that could benefit human health research, such as understanding why some people are more susceptible to cancers caused by DNA damage.
This experiment was indirectly made by unscrupulous construction companies in Taiwan in the 80s, who recycled contaminated steel for habitation buildings. When this was brought to light, scientists made a follow up on the population who had been exposed and got some interesting results.
https://www.researchgate.net/publication/239560514_Cancer_risks_in_a_population_with_prolonged_low_dose-rate_g-radiation_exposure_in_radiocontaminated_buildings_1983_-_2002
TD;DR : Some cancer rates increase, most significantly leukemia, others decrease. If you exclude leukemia, exposed people have slightly lower cancer rates. Except, you can’t, because leukemia is pretty significant and serious.