The U.S Department of Energy Office of Legacy Management (LM) has completed repairs at the LM Grand Junction, Colorado, office and city airport gamma-ray spectrometer calibration facilities. The facilities contain known amounts of naturally occurring radioactive materials, which release known amounts of radiation, to calibrate instruments and equipment used for uranium exploration, environmental remediation, and homeland security.

The facilities are recognized nationally as stable, well-characterized radiation sources and have been used by industry and government agencies since the mid-1970s. Users of the pads include DOE National Nuclear Security Administration, U.S. Environmental Protection Agency (EPA), U.S. Geological Service, Colorado Department of Public Health and Environment, and private users. Although minimal maintenance is required for the facilities, due to concrete spalling and cracks, the 40-year-old airport facility required repairs. EPA-Las Vegas, Nevada, Emergency Response Team were the first users of the rehabilitated airport pads.