Assessment of Radiation in Surface Water at the Paducah Gaseous Diffusion Plant Radiation Health Branch Division of Public Health Protection and Safety.

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Presentation transcript:

Assessment of Radiation in Surface Water at the Paducah Gaseous Diffusion Plant Radiation Health Branch Division of Public Health Protection and Safety Department for Public Health Cabinet for Health and Family Services

Objectives of Sampling Program The results of analyses for surface water samples from the automatic samplers are assessed to: 1.Ensure radionuclide discharges do not pose risks to public health; 1.Ensure the reliability of quarterly grab-sampling results; and 1.Identify temporal & spatial changes in radionuclide discharges due to past and present plant activities, hydrogeological factors, and meteorological events.

Sampling, Health and Safety, and Quality Control The RHB collects samples and maintains monitoring equipment at the PGDP as outlined in the: –Field Sampling and Analysis Plan for the PGDP (FSAP, RHB, 2003). Health and safety procedures for activities at PGDP including the collection, handling, and transport of samples are outlined in the: –Health and Safety Plan for the PGDP (HASP, RHB, 2003). Samples are analyzed as defined in the: –Laboratory Procedures Manual for the RCL (RCL, 1996). The data is verified by the laboratory and validated by an independent third party to ensure accuracy, precision, reliability, reproducibility, comparability, and completeness of the analytical results as outlined in the: –Quality Assurance Program Plan for the RCL (RHB, 2003).

Sampling and Analysis Protocol Each ISCO automated sampler operates continuously to automatically collect four (4) surface water samples per day at 6-hour intervals. The sample collection cycle for the ISCO daily-composite samples averages approximately 21 days. Sets of daily-composite samples are combined into one 21-day composite sample. The 21-day composite sample is filtered and the filtrate is acidified to stabilize the sample. The acidified filtrate is analyzed for –gross alpha/beta (α/β) activity, –gamma (γ) activity, –technetium-99 ( 99 Tc), –uranium-234 ( 234 U), uranium-235 ( 235 U), uranium-238 ( 238 U), –plutonium-238 ( 238 Pu), plutonium-239 ( 239 Pu).

Automatic Surface Water Sampler Locations

Automatic Surface Water Sampler West Side Locations

Radiation activity of isotopes reported in surface water from 2001 through 2004 for ISCO D2

Radiation activity of isotopes reported in surface water from 2001 through 2004 for ISCO D1

Radiation activity of isotopes reported in surface water from 2000 through 2004 for ISCO A

Radiation activity of isotopes reported in surface water from 2002 through 2004 for ISCO F

Radiation Dose and Risk Assessment for Surface Water Radiation dose and risk assessment for surface water collected by automatic samples B and C in Bayou Creek and automatic samplers D and G in Little Bayou Creek was conducted using: – RESRAD BASELINE, Version 2.2, 1996, Argonne National Laboratory. Potentially complete exposure pathway for locations was incidental ingestion and dermal contact of surface water while swimming, wading, fishing, etc.

Summary of Pathway Selections

Parameters for Incidental Water Ingestion Parameters for Dermal Absorption from Swimming

Radiation Dose and Risk for 2004 at ISCOs B, C, D, and G

Drum Mountain Removal