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Updated: Jun 24, 2026

Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
10:42

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Published on: May 3, 2019

Promethium-147 capacitor.

A Kavetskiy1, G Yakubova, Q Lin

  • 1TRACE Photonics Inc., 1680 West Polk Avenue, Charleston, Illinois 61920, USA.

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
|March 31, 2009
PubMed
Summary
This summary is machine-generated.

Researchers achieved high voltage from a Promethium-147 (Pm-147) beta source, demonstrating potential for direct charge capacitors. This work highlights efficient beta particle flux for energy conversion applications.

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Area of Science:

  • Nuclear Engineering
  • Materials Science
  • Applied Physics

Background:

  • Beta particle surface fluxes from various isotopes (Tritium, Ni-63, Pm-147, Sr-90) are relevant for energy conversion.
  • Previous research has explored direct charge capacitors, but achieving high current density and voltage remains a challenge.

Purpose of the Study:

  • To calculate beta particle surface fluxes for key isotopes.
  • To experimentally achieve high current density using a Promethium-147 (Pm-147) source.
  • To construct and test a direct charge capacitor for high voltage generation.

Main Methods:

  • Calculated beta particle surface fluxes for Tritium, Nickel-63 (Ni-63), Pm-147, and Strontium-90 (Sr-90).
  • Utilized a high-activity (96 GBq) Pm-147 4pi-source embedded in silica-titana glass to achieve high current density.
  • Constructed a direct charge capacitor employing a polyimide-coated collector and vacuum insulation.

Main Results:

  • Achieved high current density from the Pm-147 oxide source.
  • The constructed capacitor, using a Pm-147 source with >50% flux efficiency, generated up to 35 kV across high resistance loads.
  • Demonstrated an overall conversion efficiency exceeding 10% under optimal load conditions.

Conclusions:

  • High voltage generation is feasible using Pm-147 beta sources in direct charge capacitors.
  • The experimental setup achieved significant voltage and conversion efficiency, validating the approach.
  • This technology shows promise for specialized power applications requiring high voltage and low current.