Resolve filters for alpha source preparation
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Resolve ™ Filters for alpha source preparation. Charleston, SC May 4, 2004. Resolve ™ Filters. 0.1μ polypropylene. 25mm disks. Uniform pore size distribution. Quality control appropriate for α-spectrometry. Product Development/Validation. Evaluation of Resolve Filters

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Resolve ™ Filters for alpha source preparation

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Resolve filters for alpha source preparation

Resolve™ Filtersfor alpha source preparation

Charleston, SC

May 4, 2004


Resolve filters

Resolve™ Filters

0.1μ polypropylene

25mm disks

Uniform pore size distribution

Quality control appropriate for α-spectrometry


Product development validation

Product Development/Validation

  • Evaluation of Resolve Filters

    • Comparison with commercially available filters

      • Supplier #1

      • Supplier #2

    • Evaluate performance (alpha spec) and appearance (SEM)

  • Validate lot-to-lot variability of supplier

  • Assurance of filter quality


Reported lot to lot variability filter supplier 1 1500x

Known “poor” performing lot

Known “well” performing lot

Reported Lot-to-lot VariabilityFilter Supplier #1, 1500x


Sem comparison

Supplier #1: 1500 X

Supplier #2: 1500 X

Eichrom Filter: 1500 X

SEM Comparison


Various lots of eichrom filters

Eichrom lot A

Eichrom lot B

Eichrom lot D

Eichrom lot C

Various Lots of Eichrom Filters

1500x


Compared to poor performing lot

Eichrom lot B

Known “poor” performing lot

Eichrom lot D

Eichrom lot C

Compared to “Poor Performing” Lot

1500x

Eichrom lot A


Compared to well performing lot

Eichrom lot A

Eichrom lot B

Known “well” performing lot

Eichrom lot D

Eichrom lot C

Compared to “Well Performing” Lot

1500x


Filter blank comparison 1000 minute direct count measured activity pci in the u 232 region

Filter Blank Comparison1000 minute direct countMeasured activity (pCi) in the U-232 region


Alpha spectra lot 292218

Am-243

FWHM: 32 keV

Am-241

FWHM: 31 keV

U-232

FWHM: 23 keV

Alpha Spectra – lot 292218


Alpha spectra lot 264825

Am-243

FWHM:28 keV

Am-241

FWHM: 32 keV

U-232

FWHM:29 keV

Alpha Spectra: Lot 264825


Quality assurance program

Quality Assurance Program

  • Screening of filter material roll stock

  • SEM

    • Visual evaluation

    • Pore size uniformity: subjective determination

  • Alpha Spectrometry

    • Am-241/243; 50µg Ce

    • FWHM each peak <= 50 keV


A little background on filters

A little background on filters

  • Design and specification set on “removal” of particles from liquids.

  • Nominal “pore size” related to the size of particles removed from the liquid.

  • In alpha spec source prep the major consideration should be a uniform pore size to give the best source.

  • “Shiny side” apparent on some types of filters indicating different performance each side.


0 1 micron pore size filter

“0.1 micron” pore size filter

15,000x

Designed to remove 99.98% of particles >0.1µ

Surface pores > 0.1µ will occur

Goal of Eichrom product is uniform pore size


Resolve 0 1 micron pore size filter

Resolve “0.1 micron” pore size filter

15,000x


Two sides of the filter inside and outside of the roll stock 5 000x magnification

Two sides of the filter“Inside” and “Outside” of the Roll Stock(5,000x magnification)

Inside Lot 292218

Outside Lot 292218


Peak resolution evaluation fwhm kev

Peak Resolution EvaluationFWHM (keV)


External product evaluation

External Product Evaluation

  • Barry Stewart, Carlsbad EMRC

    • “These filters are superb for use in making sources for alpha spectroscopy.”

  • Am 241/243

  • With and without substrate

  • ASTM C1163-98, LaF3 ppt., 50 µg La carrier

  • “Glossy side” up and down


External results

External Results


Summary

Summary

  • Eichrom now supplies a 0.1µ polypropylene filter for alpha spec source prep

  • Pore size uniformity is monitored by SEM analysis and performance is measured by FWHM of Am-243/241 (specification <= 50 keV.)

  • Performance demonstrated at Eichrom and externally.

  • Both sides of filter are equivalent: no need to “put the shiny side up.”


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