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Biophysical dose measurement using electron paramagnetic resonance in rodent teeth
Rao F H Khan1, W J Rink, D R Boreham
1Medical Physics and Applied Radiation Sciences, McMaster University, 1280 Main Street West, Hamilton, Ont., Canada L8S 4M1. khanrf@mcmaster.ca
Summary
Electron paramagnetic resonance (EPR) dosimetry using mouse tooth enamel offers a new method for radiation dose assessment in non-human scenarios. Mouse enamel shows a linear EPR response to radiation, enabling accurate dose reconstruction.
Area of Science:
- Radiation dosimetry
- Biophysics
- Materials science
Background:
- Human tooth enamel is a well-established medium for electron paramagnetic resonance (EPR) dosimetry.
- Existing EPR dosimetry methods primarily focus on human samples, limiting applications in non-human contexts.
- There is a need for reliable dosimetry techniques applicable to experimental animals and environmental samples.
Purpose of the Study:
- To develop and validate an EPR dosimetry technique using mouse tooth enamel for radiation dose assessment.
- To evaluate the feasibility of using mouse enamel in scenarios not involving human subjects, such as radiation biology research or environmental monitoring.
- To compare the dosimetric properties of mouse enamel with those of human enamel.
Main Methods:
- Extraction and cleaning of mouse tooth enamel using a supersaturated KOH aqueous solution.
- Irradiation of mouse teeth and measurement of EPR signals to establish dose-response curves.
- Dose reconstruction using EPR analysis on previously irradiated mouse teeth.
- Electron microscopy to investigate structural differences in mouse tooth enamel.
Main Results:
- Mouse enamel exhibits a linear EPR response to radiation doses ranging from 0.8 to 5.5 Gy.
- Accurate dose reconstruction was achieved for irradiated mouse teeth, with results consistent with known exposures.
- The sensitivity of mouse enamel to gamma radiation is approximately half that of human enamel.
- The dosimetric EPR signal in mouse enamel remains stable for at least 42 days post-irradiation.
- Dose reconstruction was successful using molar and premolar enamel but not incisors, likely due to structural variations.
Conclusions:
- Mouse tooth enamel is a viable material for EPR dosimetry in non-human applications.
- The developed technique allows for reliable radiation dose assessment in experimental animals and potentially other non-human contexts.
- Further investigation into incisor enamel structure is warranted to understand limitations in dosimetry.