Application of a single crystal CVD diamond detector for fast neutron measurement in high dose and mixed radiation fields

Kobayashi, Makoto I.; Yoshihashi, Sachiko; Ogawa, Kunihiro; Isobe, Mitsutaka; Aso, Tsukasa; Hara, Masanori; Sangaroon, Siriyaporn; Tamaki, Shingo; Murata, Isao; Osakabe, Masaki

doi:10.1109/icce59016.2024.10444274

Cited by 1 publication

(1 citation statement)

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“…To account for the influence of the current threshold set for noise cutting in the DAQ system, a noise-cut function was applied to reshape the response matrix in low energy regions below 0.9 MeV. The specific parameters for these calculations were thoroughly evaluated in our prior study [34]. To deduce the numbers of neutrons injected into the SCD in each energy bin (corresponding to the neutron energy spectrum), the iterative calculation for equation (1) was performed using the Newton-Raphson scheme.…”

Section: Evaluation Of Neutron Energy Spectrummentioning

confidence: 99%

Simultaneous measurements for fast neutron flux and tritium production rate using pulse shape discrimination and single crystal CVD diamond detector

Kobayashi,

Yoshihashi,

Ogawa

et al. 2024

Nucl. Fusion

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This paper presents the development of a simultaneous measurement method for fast neutron energy spectra and tritium production rates within mixed radiation fields using a single crystal Chemical Vapor Deposition (CVD) diamond detector (SDD) combined with a lithium fluoride (LiF) foil. The method involves the separation of pulses with rectangular shapes and the determination of the depth position within the single crystal diamond (SCD) struck by fast neutrons or nuclear reaction products including recoil tritons from the LiF foil based on pulse width, extracting pulse events occurred at the specific bulk region and the surface region of the SCD. Subsequently, unfolding techniques were employed to analyse the energy deposition spectrum of pulses at the specific bulk region which are induced only by fast neutrons, allowing the deduction of the fast neutron energy spectrum. To evaluate the tritium production rate, the energy deposition spectrum of pulses from events occurring at the SCD surface facing the LiF foil was analysed. By estimating the energy deposition spectrum solely induced by fast neutrons striking the SCD surface and subtracting it from the energy deposition spectrum of events at the SCD surface, the contribution of energetic ions, such as recoil tritons generated by the 6Li(n,α)3H reaction in the LiF foil, was determined. The fast neutron flux and tritium production rate obtained through this study were consistent with particle transport calculations, demonstrating the successful development of a method suitable for performance testing of fusion reactor blankets.

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Section: Evaluation Of Neutron Energy Spectrummentioning

confidence: 99%