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Updates on New Eichrom Chromatographic Materials for Radium Separation

Learn about the latest advancements in chromatographic materials, including MnO2, DGA, and Sr2, for efficient radium separation. Explore automated systems for measuring radium isotopes and decay chains of uranium series. Discover the pH dependence and protocols for optimal performance.

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Updates on New Eichrom Chromatographic Materials for Radium Separation

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  1. Updates on New Eichrom Chromatographic Materials For Radium Separation Including MnO2 DGA Sr2 Natasha Dimova, Bill Burnett - Florida State University E.Philip Horwitz PG Research Foundation

  2. Acknowledgments FSU Graduate Students Henrieta Dulaiova Ricky Peterson PG Research Foundation

  3. MnO2-Resin Simple sample preparation High capacity-Kd=2.4x104 RAD-7 counting system Alpha detector-spectrum of alpha emitters 218Po, 214Po, 216Po RAD-7-MnO2-Resin automated systemfor measurements of 224Ra and 226Ra in water samples

  4. Decay chains of uranium and thorium series Th-232 U-238

  5. The separation of Ra2+ is due to the adsorption of the bi-valent ions on partly negative charge surface of the MnO2 Resin MnO2-Resin: pH dependence Ra 2+ - - Ra 2+ - Ra 2+ - - Ra 2+ - Ra 2+ - - Ra 2+

  6. x x Measurements of 224Ra and 226Ra in water samples: automated system schematic DRYING TUBE 1/4˝ FILTER 224/226Ra on MnO2-RESIN 1/4˝ IN OUT (pump) 1/4˝ 3/16˝ 1/4˝ 1/4˝ RAD-7 1/4˝ TWO-WAY VALVE

  7. Ra-226 (T1/2=1600 y) Flush for 10 min thru cartridge and switch to protocol: ch.A: use after 1st 15 min ( 218Po = 222Rn). ch.(A+C): use after 3 hrs (214Po = 222Rn). use a count time long enough to ensure good counting statistics. Ra-224 (T1/2=3.6 d) The cartridge must be continuously flushed: ch.B: use ~15 min cycle with about 10 recycles. equilibration in the 224Ra–220Rn chain (requires ~ 5 min). use “DRYSTIK” to control moisture. count time long enough to ensure good counting statistics. RAD-7 - MnO2-Resin:recommended protocols

  8. RAD-7 - MnO2-Resin:calibration curve 224/226Ra on MnO2-RESIN TWO-WAY VALVE

  9. Diphonix DGA Resin, Normal Comparison of DGA Resin, Normal and Diphonix: retention

  10. Ra-228 via 2-Column Approach sample in 2M HCL I Diphonix HEDPA – AC sample in 2M HCL II Diphonix Ra2+ hold >30 hrs Ac3+ ingrowth Ra2+ alpha source • LSC • oxidation for discarding organic component; beta counting HEDPA – Ac3+ Nour, S et al. / Applied Radiation & Isotopes 61 (2004) 1173-1178

  11. Diphonix DGA Resin, Normal Comparison of DGA Resin, Normal and Diphonix: elution

  12. 3 + - M ( N O ) E M + 3 N O + 3 E 3 3 3 3 M = L n , A n TN-DGA-extraction chromatographic resin Extractant: N,N,N’,N’-tetra-n-alkyl-3-oxopentanediamide (TN-DGA)

  13. DGA-Conclusions • Strong retention as Diphonix for tri-valent ions: Kd~105 ml/g. • Easier elution from DGA Resin, Normal • direct counting of Ac-228 on beta counter or LSC. • no need of organic (HEDPA) oxidizing step. • eluent dilute acid (0.5M HCl).

  14. Sr2 Resin, Strontium extraction chromatographic resin Extractant: 4,4”(5’)-di-t-butylcyclohexano-18-crown-6 AE 2+ + NO3- +Cr AE (Cr) (NO)3

  15. Summary • RAD-7-MnO2-Resin automated system is a powerful tool for determination of 224Ra and 226Ra in natural waters without chemical separation. • DGA-extraction chromatographic resin has the same high Kd for Actinium as Diphonix with the benefits of easier elution with 0.5M HCl. • Sr2 Strontiumextraction chromatographic resin can be successfully used for Ba/Ra separation.

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