Metal ion-organic compound for high sensitive ESR dosimetry

Area of Science:

• Materials Science
• Radiation Chemistry
• Dosimetry

Background:

• Electron spin resonance (ESR) dosimetry requires sensitive and tissue-equivalent materials.
• Investigating novel materials is crucial for advancing radiation detection technologies.

Purpose of the Study:

• To systematically study lithium acetate dihydrate and lithium phosphate as potential ESR dosimeters.
• To evaluate the dosimetric properties, including radical formation, dose response, thermal stability, and UV-illumination effects of selected materials.

Main Methods:

• Irradiation of lithium acetate dihydrate, lithium phosphate, magnesium lactate, and lithium lactate with gamma-rays.
• Analysis of radical species using Electron Spin Resonance (ESR) spectroscopy.
• Determination of G-values, thermal stability, and UV-illumination effects.
• Estimation of material lifetimes using Arrhenius plots.

Main Results:

• Acetate radicals were identified in Li-Ac.2H2O, and lactate radicals in Mg(Li)-lactate and Li(Mg)-lactate, with characteristic ESR spectra and g-factors.
• Lithium phosphate exhibited anisotropic g-factors.
• G-values ranged from 0.4 to 1.35.
• Estimated lifetimes for Li-phosphate, Mg(Li)-lactate, and Li(Mg)-lactate were approximately 2.0, 50.7, and 10 years, respectively.

Conclusions:

• Lithium phosphate and magnesium lactate demonstrate potential as sensitive and stable materials for gamma-ray dosimetry.
• Further research is needed to optimize Li-Ac.2H2O for dosimetry applications due to its thermal instability.