CHARACTERIZATION OF AN IN-HOUSE DEVELOPED MULTI-CYLINDRICAL MODERATOR NEUTRON SPECTROMETER
T Liamsuwan1, J Channuie1, S Wonglee1
1Nuclear Research and Development Division, Thailand Institute of Nuclear Technology (TINT), Ongkharak, Nakorn Nayok, Thailand.
Radiation Protection Dosimetry
|October 18, 2017
Summary
This study characterizes a new multi-cylindrical moderator neutron spectrometer. The spectrometer accurately measures neutron spectra and fluence rates up to 10 MeV, validated by simulations and experiments.
Area of Science:
- Nuclear instrumentation
- Neutron physics
- Spectroscopy
Background:
- Neutron spectrometers are crucial for radiation monitoring and nuclear applications.
- Characterizing new instruments is essential for reliable measurements.
- Existing methods may have limitations in certain energy ranges.
Purpose of the Study:
- To characterize an in-house developed multi-cylindrical moderator neutron spectrometer.
- To validate its performance using Monte Carlo simulations and experimental measurements.
- To assess its capability for neutron spectrum unfolding.
Main Methods:
- Development of a multi-cylindrical moderator neutron spectrometer using a 3He proportional counter and moderator shells.
- Monte Carlo simulations to calculate the spectrometer's response matrix from 10-8 MeV to 10 MeV.
- Experimental verification using standard neutron fields (0.144 MeV, 1.2 MeV, 241AmBe) and the shadow cone technique.
Main Results:
- Calculated and measured responses showed good agreement (<10% differences) for moderated configurations.
- Larger deviations were observed for the bare counter configuration.
- The spectrometer demonstrated reliable neutron spectrum and fluence rate determination up to 10 MeV.
Conclusions:
- The developed multi-cylindrical moderator neutron spectrometer is a viable tool for neutron measurements.
- The instrument's performance is well-characterized and validated for energies up to 10 MeV.
- It provides reliable neutron spectrum unfolding, essential for various applications.
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