I worked for a while in the commercial nuclear power industry. At work, we were required to wear a dosimeter to measure the cumulative radiation dose we received. At regular intervals, the dosimeters were collected and read to determine how each individual fared. Interestingly, we were warned to not leave the dosimeter on granite countertops when we were home. The natural stone countertops have enough inherent radiation that, over time, can be read with the dosimeter. Things that make you go Hmmmm.......
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