Microelectromechanical Transducer to Monitor High-Doses of Nuclear Irradiation

Area of Science:

• Nuclear Engineering
• Materials Science
• Microelectromechanical Systems (MEMS)

Background:

• Accurate monitoring of high irradiation doses is critical in nuclear environments.
• Existing dosimetry methods may have limitations in harsh radiation conditions.
• Understanding material radiolysis is essential for predicting component lifespan.

Purpose of the Study:

• To design, fabricate, and evaluate a passive microelectromechanical transducer for wireless radiation dosimetry.
• To investigate the gas emission properties of polymers under irradiation.
• To validate the performance and material selection for the dosimeter.

Main Methods:

• Fabrication of a sealed cavity microelectromechanical transducer using high-density polyethylene.
• Exposure of the device to ionizing radiation to induce gas release and membrane deflection.
• Measurement of dielectric membrane deflection to estimate pressure changes and radiation dose.
• Analysis of polymer outgassing properties and radiolysis yield factor.

Main Results:

• Demonstrated functionality of the microelectromechanical dosimeter for doses up to 80 kGy.
• Validated the airtightness of the sealed cavity up to 4 MGy.
• Analyzed the outgassing properties of high-density polyethylene relevant to radiolysis.

Conclusions:

• The developed passive microelectromechanical transducer is a viable technology for wireless monitoring of high irradiation doses.
• The device enables in-situ study of polymer radiolysis, contributing to material science in nuclear applications.
• Material selection and fabrication processes are crucial for the reliable performance of radiation dosimeters.