Personal radiation dosimeter badges are the things that you may have seen people wearing in nuclear power plants, that measure how much radiation is in the immediate environment. Unfortunately, the devices don’t provide real-time feedback – instead, they must be sent off to a processing lab, which determines the wearer’s radiation exposure after the fact. Now, however, the U.S. Department of Homeland Security’s Science and Technology Directorate (S&T) is working on a wallet-sized card that would serve the same purpose, but that could also be read on the spot using a handheld reading device. Called the Citizen's Dosimeter, it could be used to detect the presence of ionizing radiation caused by nuclear accidents or dirty bombs.
Read the full article: Wallet-sized dosimeter would alert users to dangerous radiation levels