There is a wide list of sources of contamination by alpha emitters : radon, drink- and seawater, “NORMs” in coal, fertilizers, oil, gas, building material, ore mining, and artificial sources (atomic test fallout, nuclear accidents...) all able to go through the food chain (esp. meat). Waste incineration burns lots of products (eg plastics) contaminated with NORMs. Sewage also brings alpha emitters from the food chain recycled for agriculture. The IARC Group 1 list includes all alpha emitters in internal contamination. No study on chemicals and health ever confronted the results with that list. The very limited effect of chemicals can be predicted from the weakness of the chemical energy the atom can produce, approximatively one million times inferior to the energy of a single alpha decay – 3 to 7 MeVs. This is here demonstrated through an extensive study of epidemiological results, using the radioactivity source easiest to track, natural radioactivity.