The Defense Advanced Research Projects Agency (DARPA) is a federal agency that does futuristic research for the government. They are active across a wide range of sciences and technologies. They are not a U.S. space agency, but they do have a space projects umbrella called PE 0603287E. The budget for 2021 was one hundred and ninety million dollars.
There has been a lot of publicity about lead in drinking water in cities across the U.S. since the crisis in Flint, Michigan made headlines. Now a new investigation shows that over half of the drinking water consumed in the U.S. contains radioactive materials.
Issues of nuclear safety and security are so important because nuclear power is based on the use of highly radioactive isotopes that pose a serious threat to public health and the environment. However, some other types of power generation also involve radioactive materials. The sludge produced by coal power plants have radioactive isotopes.