science

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

diseases within the minimal latent periods and were not attributable to the exposure from RCBs. On the basis of the remaining 95 patients, we found that staying in RCBs was associated with increased risks of thyroid cancers (7 patients, SIR = 2.6, 95% confidence interval [CI] 1.1 – 5.4) and non-Hodgkin’s lymphoma (5 patients, SIR = 5.4, 95% CI 1.8 – 12.6) and a trend of developing leukemia except chronic lymphocytic leukemia (CLL) (7 patients, SIR = 2.2, 95% CI 0.9 – 4.6), for both genders combined. (Table

1. On the other hand, the exposed population had lower risks for all cancers combined excluding leukemia (SIR = 0.8, 95%, CI 0.6 – 0.9) and all solid cancers combined (SIR = 0.7, 95% CI 0.6 – 0.9)

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.