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The Auger effect in physical and biological research
H Nikjoo1, D Emfietzoglou, D E Charlton
1Radiation Biophysics Group, Medical Radiation Physics, Karolinska Institute, Stockholm, Sweden. hooshang.nikjoo@ki.se
International Journal of Radiation Biology
|December 9, 2008
Summary
This study advances the physics of radiationless transitions, presenting new Auger spectra for iodine isotopes (125)I and (124)I. Monte Carlo simulations refine understanding of low-energy electron tracks in condensed media.
Area of Science:
- Nuclear Physics
- Atomic Physics
- Radiation Physics
Background:
- Radiationless transitions are crucial in atomic and nuclear processes.
- Auger electron emission follows inner-shell ionization, particularly in heavy elements.
- Accurate modeling of low-energy electrons is essential for dosimetry and radiation biology.
Purpose of the Study:
- To report progress in the physics of radiationless transitions.
- To present new Auger electron spectra for iodine-125 and iodine-124.
- To advance Monte Carlo track structure simulations for low-energy electrons.
Main Methods:
- Utilized input data for electron capture (EC) and internal conversion (IC) from physics data libraries.
- Employed Monte Carlo techniques for simulating Auger electron spectra.
- Generated electron tracks using Monte Carlo track structure methods.
Main Results:
- Presented data for EC, IC, and binding energy (BE) for (124)I and (125)I.
- Provided examples of individual decay electron spectra for both radionuclides.
- Discussed recent Monte Carlo track structure developments for condensed media, focusing on accuracy for low-energy, short-range Auger electrons.
Conclusions:
- Accuracy of calculated electron spectra depends on reliable physics data, highlighting existing data gaps.
- Further comparison between analytical and Monte Carlo methods is needed to refine calculations.
- Improved models for sub-keV electron interactions exist, but experimental data are required for validation; online data/program availability is recommended.
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