CDPHE has analyzed cancer-registry data around Rocky Flats for decades. But cancer-registry analysis is not the same as monitoring the long-term health of people who may have been exposed during Rocky Flats operations. Understanding that distinction is essential to understanding what Colorado's cancer studies can—and cannot—tell us.

CDPHE says decades of cancer monitoring have not found elevated rates among residents living near Rocky Flats. But who was actually studied: people present during potential exposure or people living nearby when diagnosed? Our exchange with Colorado’s cancer registry examines this critical distinction

The Union of Concerned Scientists explains how ionizing radiation can affect the body immediately or contribute to illnesses that emerge years later. Learn why this research matters to communities connected to the nuclear-weapons life cycle, including Rocky Flats.

Colorado has monitored cancer incidence around Rocky Flats for decades, but an exchange with the state's cancer registry raises an important methodological question: Can data based largely on where people live when diagnosed adequately evaluate a community defined by where people may have lived and been exposed decades earlier?