Monte Carlo simulation of Auger-electron spectra

Area of Science:

• Nuclear Physics
• Radiochemistry
• Medical Physics

Background:

• Electron-capture (EC) decay involves the emission of electrons and X-rays.
• Accurate spectral analysis of EC nuclides is vital for various applications.
• Existing methods may not fully account for complex decay processes.

Purpose of the Study:

• To develop and validate a procedure for calculating complex electron spectra from EC nuclides.
• To compare computed spectra with experimental data from liquid scintillation counting.
• To assess the relevance of these calculations for dosimetry and DNA damage studies.

Main Methods:

• A computational model was developed to simulate complex electron and X-ray spectra.
• The model was applied to specific EC radionuclides: Iodine-125 (125I), Iodine-123 (123I), and Indium-111 (111In).
• Computed spectra were adjusted for liquid scintillator response, chemical quenching, and amplifier characteristics.

Main Results:

• The procedure successfully calculates complex spectra for EC nuclides.
• Calculated spectra show good agreement with experimental liquid scintillation counting data after corrections.
• The model provides a valuable tool for spectral analysis in radiochemistry.

Conclusions:

• The developed procedure accurately models complex electron-capture decay spectra.
• This work enhances the application of free parameter models in liquid scintillation counting.
• The findings are significant for assessing the biological impact of EC nuclides, particularly on DNA.