1 / 27

The Determination Of 226 Ra In Soil Samples

The Determination Of 226 Ra In Soil Samples. Lawrence D. Morris General Engineering Laboratories, Inc. Anil H. Thakkar Eichrom Technologies, Inc. Objective: Design a reliable method to measure 226 Ra in soil samples by Alpha Spectroscopy thus meeting the current need of our clients.

geraldolsen
Télécharger la présentation

The Determination Of 226 Ra In Soil Samples

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. The Determination Of 226RaIn Soil Samples Lawrence D. Morris General Engineering Laboratories, Inc. Anil H. Thakkar Eichrom Technologies, Inc.

  2. Objective: Design a reliable method to measure 226Ra in soil samples by Alpha Spectroscopy thus meeting the current need of our clients. • Faster Turn Around Times than current methods • This procedure utilizes Cation and Eichrom’s Ln Resin • Achieve Peak Resolution (FWHM) of less than 100keV General Engineering Laboratories, Inc. Charleston, SC

  3. Anil Thakkar visited GEL in April • Discussed the Radium in Water procedure • Ran some test samples General Engineering Laboratories, Inc. Charleston, SC

  4. Spectrum from Testing Water Procedure General Engineering Laboratories, Inc. Charleston, SC

  5. Spectrum from Testing Water Procedure • This brought up the question about how well the procedure would work with soils? General Engineering Laboratories, Inc. Charleston, SC

  6. Highlights of the Procedure:Radium in Water (RAW03)Eichrom Technologies, Inc. • Digest the sample • Dissolve the residue with dilute HNO3 • Pass sample through Cation resin column • Elute Ra and Ba with 8M HNO3 • Evaporate eluate to dryness • Dissolve residue with 0.095M HNO3 General Engineering Laboratories, Inc. Charleston, SC

  7. Highlights of the Procedure:Radium in Water (RAW03)Eichrom Technologies, Inc. • Pass through Ln Column collecting the eluate for determination of 226Ra • Perform Barium Sulfate micro-precipitation • Filter • Count on Gamma for Tracer Recovery (133Ba) • Count on Alpha for 226Ra determination General Engineering Laboratories, Inc. Charleston, SC

  8. Test #1 Results General Engineering Laboratories, Inc. Charleston, SC

  9. Test #1 SpectraSample 1 General Engineering Laboratories, Inc. Charleston, SC

  10. Test #1 SpectraSample 3 General Engineering Laboratories, Inc. Charleston, SC

  11. Test #1 SpectraSample 6 (LCS) General Engineering Laboratories, Inc. Charleston, SC

  12. Problem with initial testing: • Resolution exceeded 100keV • Suspected cause was from natural Barium in the soil. General Engineering Laboratories, Inc. Charleston, SC

  13. Proposed solutions: • Use less sample • Use less Barium Carrier • 100L of 0.75 mg/mL Barium Carrier was used for Test #1 • Use less Seeding Suspension General Engineering Laboratories, Inc. Charleston, SC

  14. Test #2 • Analyze 3 samples with No Barium Carrier • Analyze 3 samples with 50 L of Barium Carrier • Vary aliquot size from 0.1g to 0.5g General Engineering Laboratories, Inc. Charleston, SC

  15. Test #2 Results General Engineering Laboratories, Inc. Charleston, SC

  16. Problem with Test #2: • Resolution on samples with reduced Barium Carrier continue to exceed 100keV General Engineering Laboratories, Inc. Charleston, SC

  17. Test #2 SpectraSample 1 General Engineering Laboratories, Inc. Charleston, SC

  18. Test #2 SpectraSample 3 General Engineering Laboratories, Inc. Charleston, SC

  19. Test #3 • Used 0.1mL of the seeding suspension • 0.2mL used previously • No Barium Carrier was used General Engineering Laboratories, Inc. Charleston, SC

  20. No Barium Yields FAILURE Test #3 General Engineering Laboratories, Inc. Charleston, SC

  21. Test #4 • Comparison of Alpha Spec vs. Emanation • Alpha Spec • Used 0.2g of sample • 50L of Barium Carrier • Emanation used 0.5g of sample General Engineering Laboratories, Inc. Charleston, SC

  22. Test #4 Results General Engineering Laboratories, Inc. Charleston, SC

  23. Test #4 SpectraSample 1 General Engineering Laboratories, Inc. Charleston, SC

  24. Test #4 SpectraSample 2 General Engineering Laboratories, Inc. Charleston, SC

  25. Update to the Objective • Further discussions with the client revealed they were never able to achieve resolution <100keV • They re-set their requirement to <250keV • Current testing Average FWHM • 149keV • Consistently <200keV General Engineering Laboratories, Inc. Charleston, SC

  26. Changes to 226Ra Water Procedure • Ensure that 0.5g or less of soil used • Minimizes natural Barium introduced • Reduce Barium carrier used • 50µL 0.75mg/mL General Engineering Laboratories, Inc. Charleston, SC

  27. In Conclusion • Original FWHM Goal (<100keV) not achieved • Client changed their requirement to <250keV • Average FWHM for soils 149keV • Faster Turn Around Times accomplished • Soils can be run in 2 days • Emanation 3 day minimum • Gamma 7-30 day minimum • Waters can be run in 1 day General Engineering Laboratories, Inc. Charleston, SC

More Related