Presentation on theme: "A Simple Method for the Analysis of Po 210 : An Initial Report D.K. Mann and J.K. Franse Y-12 National Security Complex BWXT Y-12 LLC Analytical Services."— Presentation transcript:
A Simple Method for the Analysis of Po 210 : An Initial Report D.K. Mann and J.K. Franse Y-12 National Security Complex BWXT Y-12 LLC Analytical Services Organization 113C Union Valley Road, Oak Ridge, TN 37830, USA DISCLAIMER This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, make any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. COPYRIGHT NOTICE The submitted manuscript has been authored by a subcontractor of the U. S. Government under contract DE ‑ AC05 ‑ 84OR21400. Accordingly, the U. S. Government retains a paid ‑ up, nonexclusive, irrevocable, worldwide license to publish or reproduce the published form of this contribution, prepare derivative works, distribute copies to the public, and perform publicly and display publicly, or allow others to do so, for U. S. Government purposes.
General Outline zLittle bit of History zReview of Pb 210 Procedure zProblems with Po 210 and Bi 210 Separation zDevelopment of Po 210 Procedure zData and Final Procedure zBenefits and Drawbacks zFuture Work
Introduction zMember of the Uranium Decay Series (found naturally) zPb 210 ---->Bi 210 ---->Po 210 zUsed extensively as Environmental process tracers (Atmospheric, Terrestrial, Oceanic) zIsotope ratio allows use as source locator
The Project and Problems zPo 210 as source of high alpha in Hi-Vol Ambient Air monitors. zNeeded quick and inexpensive method (very little funding). zNo funds for Tracer. zMinimal Sample Size. zStartup time was minimal.
Carrying of Po 206 on Te Te Precipitated by SnCl 2 Taken from NAS-NS Nuclear Science Series “The Radiochemistry of Polonium”, pp.56-57, 1961
Dependency of Po 210 Recovery on Te Concentration
Dependency of Po 210 recovery with varying Acid Concentrations zPlot shows Recovery of Po 210 with varying acid concentrations. Average for 0.1M HCL is 66.3 +/- 1.2 with a RSD of 1.8%. When using 4M HCL, the recovery is slightly less, averaging 62.0 +/- 1.3 with a RSD of 2.0 %.
Dependency of Po 210 Resolution (FWHM) with varying Acid Concentrations zPlot shows Resolution of Po 210 spectrum with varying acid concentrations. Average for 0.1M HCL is 144.7 +/- 13.6 keV with an RSD of 9.4%. When using 4M HCL, the overall resolution is better, averaging 98.8 +/- 19.5 keV with a RSD of 19.5 %.
Benefits of Po 210 Method zRelatively Inexpensive zRequires no special equipment zAble to use existing Eichrom Pb 210 procedure zRapid (1 hour from elution to counting) zCan use a Tracer
Drawbacks of Po 210 Method zRecovery not quantitative (60-70%). zResolution fairly large (70-100 keV). zNot as good as PERALS or Silver Disk method. zMay not be practical for labs who Electroplate.
Future Work zIncrease recovery (better Flocculation) zDecrease FWHM (activity on surface) zTry method with High Uranium Samples zWhat is the effect of heating zTry different Filter types (larger/smaller pore size)