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
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
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


compared to poor performing lot
Eichrom lot B

Known “poor” performing lot

Eichrom lot D

Eichrom lot C

Compared to “Poor Performing” Lot


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


alpha spectra lot 292218

FWHM: 32 keV


FWHM: 31 keV


FWHM: 23 keV

Alpha Spectra – lot 292218
alpha spectra lot 264825

FWHM:28 keV


FWHM: 32 keV


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


Designed to remove 99.98% of particles >0.1µ

Surface pores > 0.1µ will occur

Goal of Eichrom product is uniform pore size

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

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
  • 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.”