High-level dosimetry at the demagnetization experiments of permanent magnets

Area of Science:

• High-energy physics
• Radiation detection and measurement
• Materials science

Background:

• High-energy electron accelerators produce mixed radiation fields requiring precise dosimetry.
• Understanding radiation effects on materials, like rare earth permanent magnets, is critical for accelerator applications.
• Existing dosimetry methods may have limitations in high-dose, mixed-field environments.

Purpose of the Study:

• To develop and validate a radiation damage monitor for high-energy, high-dose mixed radiation fields.
• To assess the performance of Radiation-Sensing Field-Effect Transistors (RADFETs) and Si PIN diodes for dosimetry.
• To support demagnetization studies of rare earth permanent magnets under electron beam irradiation.

Main Methods:

• Utilized a radiation damage monitor comprising two RADFETs and a Si PIN diode.
• Calibrated detector sensitivities using various neutron sources (65-MeV, 14-MeV, (252)Cf) and gamma ray sources ((60)Co, (137)Cs).
• Performed dose and fluence measurements on Cu, Ta, and Pb targets, comparing results with FLUKA code simulations.

Main Results:

• Measured detector sensitivities were within acceptable ranges compared to manufacturer specifications.
• Dose and fluence measurements showed good agreement with FLUKA code calculations.
• The monitor effectively measured mixed radiation in a high-energy electron accelerator environment.

Conclusions:

• The developed radiation damage monitor is suitable for high-level dosimetry at high-energy electron accelerators.
• The system provides reliable measurements for mixed radiation fields, aiding in material studies.
• This approach offers a viable solution for dosimetry challenges in advanced accelerator facilities.