Feasibility study of an electret dosimetry technique

Area of Science:

• Medical Physics
• Radiation Detection and Measurement

Background:

• Traditional ionization chambers require external power for operation and readout.
• Electret-based dosimeters offer potential for passive and self-powered radiation measurement.

Purpose of the Study:

• To describe the characteristics and performance of a novel radiation charged electret dosimeter.
• To evaluate its suitability for accurate air kerma measurements in various conditions.

Main Methods:

• The dosimeter utilizes a parallel-plate ionization chamber with a polymer-coated electrode to form an electret.
• Ions generated by radiation are trapped on the electret surface, creating a self-field for subsequent measurements.
• Charge depletion, proportional to air kerma, is measured using an electrometer after irradiation.

Main Results:

• The electret dosimeter allows for simultaneous charging, calibration, field use, and in situ readout without dismantling.
• Investigated parameters include calibration, energy dependence, air kerma range, and reproducibility.
• Guard-ring effects on linearity and natural charge decay were also assessed.

Conclusions:

• The radiation charged electret dosimeter presents a promising self-powered and reusable solution for radiation monitoring.
• Its design facilitates convenient field deployment and in situ characterization.