Neutron Spectrometry Techniques in Radiation Fields
Summary
Neutron spectrometry is a vital methodology for characterising the energy distribution and fluence of neutrons in diverse radiation environments. Techniques range from the classical Bonner Sphere Spectrometer, which employs moderators of varying thickness with thermal neutron detectors, to advanced single‐moderator and semiconductor‐based devices capable of rapid, directional and high-resolution measurements. Central to these methods are response matrices, which relate detector signals to incident neutron spectra, and mathematical unfolding algorithms that invert these responses to recover the original energy distribution. Recent advances have integrated Monte Carlo simulations with novel detector architectures to expand energy coverage from thermal energies through fast and high-energy regimes, while improving portability and sensitivity. Applications span radiation protection, calibration of neutron sources, accelerator and fusion-facility commissioning, neutron capture therapy quality assurance and cosmic-ray studies. The evolution of electronic personal dosemeters and compact spectrometers has further extended real-time monitoring in complex workplaces, supporting ALARA compliance and enhancing safety in nuclear, medical and industrial settings.
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Neutron Spectrometry Techniques in Radiation Fields publication trend
The graph below shows the total number of articles in neutron spectrometry techniques in radiation fields across all publications each year (not limited to Nature Index journals).
Technical terms
Neutron spectrometry: Measurement of the energy spectrum and fluence of neutrons in a radiation field.
Bonner Sphere Spectrometer (BSS): System of polyethylene moderators of varying size with thermal neutron detectors used to sample wide neutron energy ranges.
Response matrix: Mathematical representation linking detector outputs to incident neutron energy distributions.
Unfolding: Computational inversion of detector responses to reconstruct the original neutron energy spectrum.
Moderator: Material, often hydrogenous, used to slow neutrons to thermal energies for detection.
Thermal neutrons: Neutrons in thermal equilibrium with their environment, typically around 0.025 eV.
Fast neutrons: Neutrons with energies above 1 MeV, requiring specialised detection and moderation.
References
- The NCT-WES directional neutron spectrometer: validation of the response with monoenergetic neutron fields. The European Physical Journal Plus (2023).
- Design and development of the extended-range Bonner sphere spectrometer at Ciemat. Radiation Physics and Chemistry (2024).
- DOIN: a novel electronic personal dosemeter for neutrons. The European Physical Journal Plus (2023).
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