Comparison of Chernobyl and other radioactivity releases
This article compares the radioactivity release and decay from the Chernobyl disaster with various other events which involved a release of uncontrolled radioactivity. == Chernobyl compared to background radiation == Natural sources of radiation are prevalent in the environment, and come from cosmic rays, food sources (bananas have a particularly high source due to potassium-40 but all foods contain carbon and thereby carbon-14), radon gas, granite and other dense rocks, and others.
Source: Wikipedia — Comparison of Chernobyl and other radioactivity releases (CC BY-SA 4.0)