1. High-level dosimetry at the demagnetization experiments of permanent magnets
- Author
-
Chinwha Chung, Sukmo Hong, Junli Li, Hee-Seock Lee, Rui Qiu, and T. Bizen
- Subjects
Astrophysics::High Energy Astrophysical Phenomena ,Physics::Medical Physics ,Radiation ,Radiation Dosage ,Sensitivity and Specificity ,Magnetics ,Nuclear magnetic resonance ,Radiation Protection ,Neutron flux ,Radiation Monitoring ,Radiation damage ,Dosimetry ,Radiology, Nuclear Medicine and imaging ,Neutron ,Physics ,Neutrons ,Radiological and Ultrasound Technology ,business.industry ,Public Health, Environmental and Occupational Health ,Gamma ray ,Reproducibility of Results ,General Medicine ,Equipment Design ,Equipment Failure Analysis ,Absorbed dose ,Radiation protection ,Atomic physics ,Particle Accelerators ,business - Abstract
The measurements of high-energy and high dose mixed radiation from high-energy electron accelerator are carried out using a radiation damage monitor. It consists of two Radiation-Sensing Field-Effect Transistors (RADFETs) for total absorbed dose from mainly gamma ray and other charged particles and a Si PIN diode for neutron fluence. This is a part of the demagnetization study of rare earth permanent magnet irradiated by 2.5-GeV electron beam. The sensitivities of damage detectors are measured using 65-MeV quasi-monoenergic neutron, 14-MeV D-T neutron, (252)Cf neutron for Si PIN diode and (60)Co and (137)Cs gamma ray for RADFETs. Measured sensitivities are in acceptable range in the comparison of producer's proposed values. The dose and fluence measurements are carried out for the same target condition, Cu and Ta, as that for the demagnetization study. The 5 x 5 cm(2) cross-sectional and 5.5-cm-thick Pb target is also used for the general comparison with photoneutron yields. All measured dose and fluence are compared with the calculated results using the FLUKA code and agree well each other. The application of this kind of radiation damage monitor to high-level dosimetry at high-energy electron accelerator has been discussed.
- Published
- 2007