As a rule, when it comes to radiation, an average person imagines ruins of Chernobyl and vast areas contaminated by radiation. In the view of most people, radiation is something very specific, rare and a very fringe concern. The matter of fact is that the problem of high radiation background is relevant to everyone.
Can you be absolutely sure of how safe the tiles are in your bathroom? Is fabric from China you occasionally order on the Internet is so harmless? Where is the guarantee that a seat at your home gym, where you spend an hour a day, does not cause any harm?
Unfortunately, it is impossible to know this without special dosimeters or radioactivity detectors. As it is impossible to be certain that your house does not contain excessive amounts of radon gas. This gas kills slowly and it may even be coming from the regular household natural gas or from sand where the foundation of the house sits.