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New materials for ESR dosimetry.

A Lund1, S Olsson, M Bonora

  • 1Chemical Physics Laboratory, IFM Linköping University, Sweden. ald@ifm.liu.se

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|May 8, 2002
PubMed
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New materials like ammonium tartrate and formates show 2-10 times higher sensitivity for electron spin resonance (ESR) dosimetry compared to L-alanine. These advanced materials offer improved accuracy for high dose measurements.

Area of Science:

  • Materials Science
  • Radiation Dosimetry
  • Spectroscopy

Background:

  • L-alanine is the current standard for high-dose electron spin resonance (ESR) dosimetry.
  • There is a need for more sensitive materials to improve dose determination accuracy.

Purpose of the Study:

  • To investigate new materials for ESR dosimetry with sensitivity exceeding L-alanine.
  • To identify materials with enhanced sensitivity for high dose measurements.

Main Methods:

  • Screening of various compounds including ammonium tartrate, 2-methylalanine, formates, and dithionates.
  • Utilizing Electron Nuclear Double Resonance (ENDOR) spectroscopy to clarify radical structures.
  • Employing pulsed ESR measurements to assess microwave saturation properties.

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Main Results:

  • Ammonium tartrate, 2-methylalanine, formates, and dithionates demonstrated 2-10 times higher sensitivity than L-alanine.
  • Higher sensitivities were observed with formates and dithionates containing heavier atoms.
  • Enhanced sensitivity is linked to favorable ESR properties like narrow lines and short relaxation times.

Conclusions:

  • Several new materials significantly outperform L-alanine in ESR dosimetry.
  • The identified materials offer potential for more accurate high dose determinations.
  • Optimized ESR properties of stable radicals are key to increased dosimetric sensitivity.