MCNP5 evaluation of a response matrix of a Bonner Sphere Spectrometer with a high efficiency 6LiI (Eu) detector from 0.01 eV to 20 MeV neutrons

Mazrou, H.; Idiri, Z.; Sidahmed, Tassadit; Allab, M.

doi:10.1007/s10967-010-0493-9

Cited by 19 publications

(5 citation statements)

References 13 publications

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“…13), a neutron source, and it produces a thermal neutron flux of about 1.106 n s/cm 2 and emits a considerable number of low-energy gamma rays of 59.5 keV from 241 Am and as many high energy gamma rays (4.4 MeV) from the alpha-Be reaction. Simulation work has been undertaken on the source [25][26][27][28][29].…”

Section: Measurementsmentioning

confidence: 99%

Study and Characterization of LiF Thin Film Combined with a Silicon Detector for Neutron Metrology

Brahimi¹,

Keffous

Haine

et al. 2023

Acta Phys. Pol. A

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The last decades have seen a lot of work and development on new methods of neutron detection that would replace 3 He gas-based detectors, a device widely used due to its efficiency, which is being phased out due to the scarcity of 3 He gas and its high cost. The work showed that a combination of inorganic materials (Si, 6 LiF) could represent a viable basis for the development of new generations of thermal neutron detectors. This type of device is based on a silicon detector coupled to 6 LiF thin film converters. In this work, a model has been developed based on the fabricated silicon detector with a Schottky surface barrier associated with different thicknesses of 6 LiF films. To study its behavior as a function of the different film thicknesses, the model was characterized using a thermal neutron flux from the source (AmBe-OB26). Preliminary results show that it is possible to measure low-energy neutrons with an average detection efficiency of about 1%, a sensibility of 10 ± 0.1 cps on the 3 H peak, and insensibility to gamma radiation < 10 −6 , with a thin films size of about 2 µm. In this paper, we will present a state of the art of detector design, an evaluation of its characteristics (efficiency, resolution, dead time, proper motion), and a clarification of the influence of other parameters on the shape of the spectrum, highlighting the possibility of improving its detection efficiency to make it high, with a gamma/neutron rejection capability comparable to the 3 He gas detector.

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Section: Measurementsmentioning

confidence: 99%

Study and Characterization of LiF Thin Film Combined with a Silicon Detector for Neutron Metrology

Brahimi¹,

Keffous

Haine

et al. 2023

Acta Phys. Pol. A

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“…However, pulse pileup and dead time effects are drawbacks of using active detector in high intensity or pulsed radiation fields [7]. To overcome these problems, the active detectors of thermal neutron in BSS must be replaced by passive ones [8,9]. Using gold foils as passive detector is very conventional method for thermal neutron detection [10].…”

Section: Introductionmentioning

confidence: 99%

Neural network unfolding of neutron spectrum measured by gold foil-based Bonner sphere

Mohammadi

Hakimabad

Rafat-Motavalli

2014

J Radioanal Nucl Chem

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Bonner sphere spectrometer (BSS) based on gold foils, as thermal neutron detectors, is one of the common device for neutron spectrometry. In this paper, the response functions of the Bonner spheres were determined for neutrons with energies ranging from thermal up to 20 MeV using Monte Carlo code. To verify the simulated response functions, the spheres of BSS were irradiated with 241 Am-Be neutron source at the Ferdowsi University of Mashhad and the activities of the gold foils were measured. Then the artificial neural network was applied for neutron spectrum unfolding. The results showed a good agreement between unfolded and reference spectrum of ISO 8529-1.

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“…Teknik ini sangat bergantung pada fungsi respon yang digunakan untuk lingkup spektrometer yang biasanya dihitung dengan cara Monte Carlo (MC) menggunakan program, seperti Monte Carlo N-Particle (MCNP)[8], the FLUktuierende KAskade (FLUKA)[9], Particle and Heavy Ion Transport System (PHITS)[10], dan GEometry ANd Tracking (GEANT4)[11]. Penggunaan varian dari program MCNP untuk menghitung fungsi respon detektor neutron telah dilakukan oleh Mares dan Schraube (1994) dengan menggunakan MCNP4, Mazrou, dkk dengan menggunakan MCNP5, dan Decker dan tim (2017) dengan menggunakan MCNP6[12][13][14]. Varian dari program MCNP yang merupakan pengembangan dari era MCNP4 hingga MCNP6 yakni MCNPX adalah yang digunakan dalam penelitian ini untuk menghitung fungsi respon detektor.…”

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Pengukuran Spektrum Neutron Pada Tabung Berkas Neutron Radiografi Reaktor G.A. Siwabessy Dengan Single Sphere Spectrometer

Tursinah

Bunawas²,

Tarmulah³

et al. 2018

gnd

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Telah dilakukan pengukuran spektrum neutron pada tabung berkas neutron fasilitas radiografi neutron reaktor G.A Siwabessy. Pengukuran dilakukan untuk mengkonfirmasi adanya faktor penyebab menurunnya kualitas ketajaman citra hasil dari radiografi. Pengukuran spektrum neutron dilakukan menggunakan single sphere spectrometer (SSS) dengan tujuh detektor keping emas. Tampilan spektrum neutron dari konversi aktivitas detektor SSS dilakukan menggunakan software UMG 3.3, adapun fungsi respon detektor SSS dihitung menggunakan software MCNPX. Berdasarkan hasil pengukuran diperoleh spektum neutron didominasi termal dengan fluks termal 6,14×106 neutron cm-2s-1, epitermal 1,18×106 neutron cm-2s-1, dan neutron cepat 3,37×106 neutron cm-2s-1. Hasil pengukuran spektrum tersebut mengkonfirmasi bahwa terjadi penurunan fluks neutron termal di ujung tabung berkas neutron radiografi (dari 9,2×106 neutron cm-2s-1), sehingga hal ini bisa menjadi salah satu sebab penurunan kualitas ketajaman citra radiografi.

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MCNP5 evaluation of a response matrix of a Bonner Sphere Spectrometer with a high efficiency 6LiI (Eu) detector from 0.01 eV to 20 MeV neutrons

Cited by 19 publications

References 13 publications

Study and Characterization of LiF Thin Film Combined with a Silicon Detector for Neutron Metrology

Study and Characterization of LiF Thin Film Combined with a Silicon Detector for Neutron Metrology

Neural network unfolding of neutron spectrum measured by gold foil-based Bonner sphere

Pengukuran Spektrum Neutron Pada Tabung Berkas Neutron Radiografi Reaktor G.A. Siwabessy Dengan Single Sphere Spectrometer

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