The following links may be useful to you while researching radiation issues.
US EPA RadNet - The nationwide RadNet system monitors the nation’s air, drinking water, precipitation, and pasteurized milk to determine levels of radiation in the environment. RadNet sample analyses and monitoring results provide baseline data on background levels of radiation in the environment and can detect increased radiation from radiological incidents. There are RadNet air monitors in Fairbanks, Anchorage, and Juneau.
Radiation and Health Physics, University of Michigan Student Chapter of Health Physics Society
Centers for Disease Control and Prevention:
Energy Citations Database (1948 – Present) Copied from their website: "Energy Citations contains bibliographic records for energy and energy-related scientific and technical information from the Department of Energy (DOE) and its predecessor agencies, the Energy Research & Development Administration (ERDA) and the Atomic Energy Commission (AEC). The Database provides access to DOE publicly available citations from 1948 through the present, with continued growth through regular updates."
For document searches, try the DOE Information Bridge. Copied from their website: "The Information Bridge provides an open source to full-text and bibliographic records of Department of Energy (DOE) research and development reports in physics, chemistry, materials, biology, environmental sciences, energy technologies, engineering, computer and information science, renewable energy, and other topics. The Information Bridge consists of full-text documents produced and made available by the Department of Energy National Laboratories and grantees from 1995 forward."
See DEC Radiation's Information Bridge help page for additional information.