A citizen's dosimeter, and it fits in your wallet

No matter how many plastic cards currently crowd your wallet, one day you may wish to make room for one more. The Department of Homeland Security (DHS)'s Science and Technology Directorate (S&T) has developed a miniaturized version of a dosimeter, a portable device used for measuring exposure to ionizing radiation, which can provide life-saving early detection in the unlikely event of a nuclear accident or dirty bomb.

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