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A new 2 methylalanine-PVC ESR dosimeter
Bruno T Rossi1, Felipe Chen, Oswaldo Baffa
1Departmento de Física e Matemática, FFCLRP-Universidade de São Paulo, Av. Bandeirantes, 3900, 14040-901, Ribeirão Preto-SP, Brazil.
Summary
Polyvinyl chloride (PVC) effectively binds with 2-methylalanine (2MA) to create sensitive ESR dosimeters. This new method offers a stable, self-calibrated dosimeter for radiation measurements.
Area of Science:
- Radiation dosimetry
- Materials science
Background:
- 2-methylalanine (2MA) shows higher sensitivity than L-alanine for ESR dosimetry.
- Polyvinyl chloride (PVC) is a suitable binder due to low free radical production and material processing characteristics.
Purpose of the Study:
- Investigate the use of PVC as a binder for 2MA in ESR dosimeters.
- Develop a stable, self-calibrated dosimeter with enhanced sensitivity.
Main Methods:
- Mixing PVC and 2MA (up to 50% by weight) at room temperature to form stable pellets.
- Optimizing spectrometer settings (microwave power, modulation amplitude) for ESR signal measurement.
- Incorporating Mn2+ ions for internal calibration.
Main Results:
- PVC-2MA pellets exhibit stable mass and physical dimensions.
- Irradiated pure PVC showed weaker ESR signals than 2MA.
- The developed dosimeter allows for self-calibration using an internal Mn2+ reference signal.
Conclusions:
- PVC is a viable and effective binder for 2MA in ESR dosimetry.
- The PVC-2MA dosimeter offers a stable, sensitive, and self-calibrated solution for radiation measurement.
- This method facilitates large-scale production of dosimeters.