They also once thought that bleeding you half to death was healthy!
We’ve advanced since then.
Very low levels of radiation can be beneficial. But that doesn’t fit the agenda, so it is suppressed by the controlled media.
“Over 3,000 scientific research papers show that low dose irradiation is stimulatory and/or beneficial in a wide variety of microbes, plants, invertebrates, and vertebrates”
“Low dose irradiation activates the immune system in several ways: faster wound healing, and increased resistance to toxins, infections, and tumor cell injections”
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2477686/