1 / 14

Rapid Emergency Methods for Actinides and Sr-89/90

Rapid Emergency Methods for Actinides and Sr-89/90. Sherrod L. Maxwell, III Westinghouse Savannah River Company. Background. Radiological Preparedness Exercise (NRIP’04) Kenneth Inn, NIST spoke at RRMC-2004 of “need to improve efficiency and effectiveness of radioanalytical capabilities”

jorn
Télécharger la présentation

Rapid Emergency Methods for Actinides and Sr-89/90

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Rapid Emergency Methods for Actinides and Sr-89/90 Sherrod L. Maxwell, III Westinghouse Savannah River Company

  2. Background • Radiological Preparedness Exercise (NRIP’04) • Kenneth Inn, NIST • spoke at RRMC-2004 of “need to improve efficiency and effectiveness of radioanalytical capabilities” • Need for faster actinide and Sr-89/90 analyses for Homeland Security reasons • Current water/air filter methods may take 1-2 days • Need for fast, reliable methods (< 8 hours)

  3. Developments at SRS • Water/Air Filters Method • Streamline calcium phosphate precipitation (water) • Dissolve air filters • Collect and prepare Sr-89/90 with actinides • No ashing of Am/Cm or Th fractions • Eichrom prefilter cartridges/Resolve filters

  4. Developments at SRS • Streamline calcium phosphate precipitation • Eliminate heat step for volumes less than 200 mL/add Ba to complex carbonate • Use 200 mL (or less) sample volumes in centrifuge tubes • Prep time: ~1-1.5 hours-12 samples • Stack TEVA (Pu, Np, Th) + TRU (Am,Cm, U) + Sr Resin (Sr-89/90) • Collect Sr-89/90 at same time • Prep time: <4 hours-12 samples • Count time • actinides-1 hour (or as needed) • Sr-89/90-10 minutes (or as needed)

  5. Rapid TEVA-TRU-Sr Separations(Pu, Np, Am, Cm, U, Sr)

  6. Remove Sr on Sr Resin, Pu from TEVA and Am-Cm/U from TRU

  7. Am Strip with Prefilters Below TRU

  8. Performance • 20 groundwater samples • 200 mL volume/ 6 hour counts * • Sr carrier recoveries: 98.1% (3.9% rsd) • Pu-242 recoveries: 104% (4.9% rsd) • Am-243 recoveries: 92.6% (6% rsd) • U-232 recoveries: 85.6% (5.4% rsd) *count less time in emergency when high levels expected

  9. Other Efficiency Improvements • Eliminate ashing steps used for extractant bleed-off that affects alpha resolution • Prefilter cartridge(~$5) with Resolve filters • Saves time, labor, better FWHM • faster TAT • improved alpha resolution • less rework

  10. Resolution with Filters from “Bad” Lot

  11. Summary • Need to share radioanalytical methods-Ken Inn • Faster actinide and Sr-89/90 methods developed • Quality and Speed • Streamlined precipitation for water samples • Collect Pu, Am, Cm, U, Sr in a single stacked column • High recoveries, good resolution, no interferences • Applicable to radiological emergency analyses • Improved efficiency and effectiveness • Short count as needed • Analysis time < 8 hours

More Related