An undated photo from the 1980s, of two teenagers stepping on rocks and wooden planks on Coldwater Creek. The photo is from a scrapbook kept by Sandy Delcoure, who lived on Willow Creek in Florissant ...

The signs released by the U.S. Army Corps of Engineers warn of "low-level radioactive materials present" near Coldwater Creek in St. Louis. Federal officials plan to post warning signs along a ...

Radiation often sounds alarming, but tiny amounts of radioactive material are actually found in many common household items ...

Radioactive sources contain radioactive material of a particular radionuclide (an unstable form of an element emitting radiation), which can vary based on the application for which the source was ...

Visitors entering the Rocky Flats National Wildlife Refuge are now seeing two very different messages about safety — posted just feet apart. At the northwest entrance off Highway 128, federal signs ...

Federal officials plan to post warning signs along a contaminated suburban St. Louis creek where generations of children were exposed to radioactive material. Coldwater Creek, which winds between ...