Cumulative Plutonium Airborne Effluent Emissions

Cumulative Plutonium Airborne Effluent Emissions for 1999-2004 The graph on the left shows the cumulative airborne effluent emissions of plutonium from the Site Building stacks. Results from the most recently analyzed effluent stack samples (November 2003-February 2004) are consistent with the previous three years’ measured concentrations, with a cumulative 2003 plutonium emission of 0.0868 micro-Curies (µCi) and a 2004 year-to-date (February 2004) plutonium emission of 0.0053 micro-Curies (µCi).

Americium and uranium emissions for November 2003 through February 2004 also decreased somewhat from the same time period in previous years, a consequence of building decommissioning resulting in fewer effluent sources.

Offsite Rocky Flats Dose Rate Summary

Maximum Potential Annualized Public Dose Due to Airborne Emissions from Site Activities

The graph on the right illustrates the monthly estimated maximum potential dose rates at the perimeter sampler showing the highest total radionuclide concentrations, including contributions from naturally occurring uranium isotopes. The higher dose rates displayed in November and December 2003 occurred at locations S-209 and S-254 - to the southwest and north of the industrial area (IA), respectively. The maximum dose rates for both January and February 2004 occurred at location S-131 - to the west of the IA. The maximum potential offsite dose rate, resulting from Site activities during the March 2003-February 2004 time period, was less than 4.0% of the 10mrem standard.

Maximum Potential Annualized Public Dose Due to Airborne Emissions from Site Activities (Excluding U-234 and U-238)

This graph presents the monthly estimated maximum potential dose rates when the contribution of naturally occurring uranium-234 and -238 isotopes is excluded. The maximum dose rates for both November and December 2003 were found at S-209 - to the southwest of the Site. Both January and February 2004 dose rates were highest at S-131, to the west.

Ambient Air Data

Perimeter Sampler Locations Dose Map (12 Month Rolling Average Through August 2000) The map on the left illustrates the perimeter Radioactive Ambient Air Monitoring Program (RAAMP) sampler locations and the twelve-month rolling average maximum potential dose for March 2003 through February 2004, expressed as a percentage of EPA's air concentration-based dose limit to members of the public. The results include naturally occurring uranium isotopes as well as plutonium and americium. The highest potential dose was observed at location S-254, north of the IA.