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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.

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the determination of 226 ra in soil samples

The Determination Of 226RaIn Soil Samples

Lawrence D. Morris

General Engineering Laboratories, Inc.

Anil H. Thakkar

Eichrom Technologies, Inc.

slide2
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

anil thakkar visited gel in april
Anil Thakkar visited GEL in April
  • Discussed the Radium in Water procedure
    • Ran some test samples

General Engineering Laboratories, Inc.

Charleston, SC

spectrum from testing water procedure
Spectrum from Testing Water Procedure

General Engineering Laboratories, Inc.

Charleston, SC

spectrum from testing water procedure5
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

highlights of the procedure radium in water raw03 eichrom technologies inc
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

highlights of the procedure radium in water raw03 eichrom technologies inc7
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

test 1 results
Test #1 Results

General Engineering Laboratories, Inc.

Charleston, SC

test 1 spectra sample 1
Test #1 SpectraSample 1

General Engineering Laboratories, Inc.

Charleston, SC

test 1 spectra sample 3
Test #1 SpectraSample 3

General Engineering Laboratories, Inc.

Charleston, SC

test 1 spectra sample 6 lcs
Test #1 SpectraSample 6 (LCS)

General Engineering Laboratories, Inc.

Charleston, SC

problem with initial testing
Problem with initial testing:
  • Resolution exceeded 100keV
    • Suspected cause was from natural Barium in the soil.

General Engineering Laboratories, Inc.

Charleston, SC

proposed solutions
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

test 2
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

test 2 results
Test #2 Results

General Engineering Laboratories, Inc.

Charleston, SC

problem with test 2
Problem with Test #2:
  • Resolution on samples with reduced Barium Carrier continue to exceed 100keV

General Engineering Laboratories, Inc.

Charleston, SC

test 2 spectra sample 1
Test #2 SpectraSample 1

General Engineering Laboratories, Inc.

Charleston, SC

test 2 spectra sample 3
Test #2 SpectraSample 3

General Engineering Laboratories, Inc.

Charleston, SC

test 3
Test #3
  • Used 0.1mL of the seeding suspension
      • 0.2mL used previously
  • No Barium Carrier was used

General Engineering Laboratories, Inc.

Charleston, SC

test 320
No Barium Yields

FAILURE

Test #3

General Engineering Laboratories, Inc.

Charleston, SC

test 4
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

test 4 results
Test #4 Results

General Engineering Laboratories, Inc.

Charleston, SC

test 4 spectra sample 1
Test #4 SpectraSample 1

General Engineering Laboratories, Inc.

Charleston, SC

test 4 spectra sample 2
Test #4 SpectraSample 2

General Engineering Laboratories, Inc.

Charleston, SC

update to the objective
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

changes to 226 ra water procedure
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

in conclusion
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