Determination of the neutron energy spectrum of a radial neutron beam at a TRIGA reactor

Giegel, Sam H.; Pope, Chad L.; Craft, Aaron E.

doi:10.1016/j.nimb.2019.05.072

Cited by 11 publications

(4 citation statements)

References 12 publications

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“…The GRAVEL spectrum displayed anomalies that were corrected by creating a hybrid spectrum that included the intermediate region calculated by MCNP and the thermal and fast regions produced by the GRAVEL unfolding software. The hybrid spectrum was shown to best mimic measured results when comparing measured activities from the foils and calculated activities from the MCNP and GRAVEL spectra [26]. The neutron energy spectrum determined at the image plane in the ERS can be seen in Figure 6 as well as tabulated values for specific energy bins which are displayed in Table 9 [26].…”

Section: Neutron Energy Spectrummentioning

confidence: 79%

“…The hybrid spectrum was shown to best mimic measured results when comparing measured activities from the foils and calculated activities from the MCNP and GRAVEL spectra [26]. The neutron energy spectrum determined at the image plane in the ERS can be seen in Figure 6 as well as tabulated values for specific energy bins which are displayed in Table 9 [26]. The thermal equivalent neutron flux measured using the average thermal cross-section of gold is 9.61 × 10 6 n/cm 2 /s.…”

Section: Neutron Energy Spectrummentioning

confidence: 89%

“…The activities of these foils were measured using a calibrated HPGe detector and the resulting foil responses were calculated. An MCNP6 model of the ERS was built and used to calculate the response functions of the foils and the initial guess spectrum for input into the UMG software [26].…”

Section: Neutron Energy Spectrummentioning

confidence: 99%

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Neutron Beam Characterization at Neutron Radiography (NRAD) Reactor East Beam Following Reactor Modifications

Giegel

Craft

Papaioannou

et al. 2021

QuBS

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The Neutron Radiography Reactor at Idaho National Laboratory (INL) has two beamlines extending radially outward from the east and north faces of the reactor core. The control rod withdrawal procedure has recently been altered, potentially changing power distribution of the reactor and thus the properties of the neutron beams, calling for characterization of the neutron beams. The characterization of the East Radiography Station involved experiments used to measure the following characteristics: Neutron flux, neutron beam uniformity, cadmium ratio, image quality, and the neutron energy spectrum. The ERS is a Category-I neutron radiography facility signifying it has the highest possible rank a radiography station can achieve. The thermal equivalent neutron flux was measured using gold foil activation and determined to be 9.61 × 106 ± 2.47 × 105 n/cm2-s with a relatively uniform profile across the image plane. The cadmium ratio measurement was performed using bare and cadmium-covered gold foils and measured to be 2.05 ± 2.9%, indicating large epithermal and fast neutron content in the beam. The neutron energy spectrum was measured using foil activation coupled with unfolding algorithms provided by the software package Unfolding with MAXED and GRAVEL (UMG). The Monte-Carlo N-Particle (MCNP6) transport code was used to assist with the unfolding process. UMG, MCNP6, and measured foil activities were used to determine a neutron energy spectrum which was implemented into the MCNP6 model of the east neutron beam to contribute to future studies.

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Section: Neutron Energy Spectrummentioning

confidence: 79%

Section: Neutron Energy Spectrummentioning

confidence: 89%

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Neutron Beam Characterization at Neutron Radiography (NRAD) Reactor East Beam Following Reactor Modifications

Giegel

Craft

Papaioannou

et al. 2021

QuBS

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“…Salah satu metode pengukuran langsung adalah metode detektor swadaya [4], [5]. Sedangkan metode aktivasi bisa dipilih sebagai metode tidak langsung untuk pengukuran fluks neutron [6] [7]. Metode aktivasi dilakukan berdasarkan perubahan aktivitas radiasi keping logam tertentu setelah terjadi reaksi inti atom logam dengan neutron ketika keping logam tersebut diletakkan di medan fluks neutron.…”

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Pengukuran Laju Dosis Neutron Termal Dan Epitermal Di Tunnel Reaktor Serba Guna G. A Siwabessy Dengan Aktivasi Keping Indium

Khasanah¹,

Bunawas²,

Hudha

2022

Konstan

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Keberadaan radiasi neutron yang mempunyai rentang energi luas memiliki implikasi yang cukup signifikan untuk diperhatikan terkait dengan proteksi radiasi.Oleh karena itu, telah dilakukan pengukuran laju dosis neutron termal dan epitermal di tunnel reaktor serba guna G. A. Siwabessy yang merupakan saluran yang mengalirkan hasil reaksi fisi pada reaktor berupa radiasi neutron dan energi panas. Pengukuran dilakukan dengan metode aktivasi keping Indium dan Indium dilapisi Cadmium di atas tunnel tersebut. Setelah itu, keping Indium meluruh menghasilkan radiasi gamma yang dicacah menggunakan spektrometer gamma HPGe (High Purity Germanium). Hasil cacahan tersebut digunakan untuk menghitung besarnya fluks dan laju dosis neutron termal dan epitermal. Sehingga didapatkan bahwa fluks dan laju dosis thermal maupun ephitermal yang paling besar diperoleh di titik sambungan antara parafin. Selain itu, didapatkan bahwa pada titik tersebut laju dosis neutron epitermal sebesar 9,2 μSv/jam dan neutron termal sebesar 2,2 μSv/jam atau 80,7% didominasi oleh neutron epitermal. Hasil tersebut hampir sama jika dibandingkan dengan hasil pengukuran spektrum radiasi neutron dengan menggunakan Bonner Sphere yang menunjukkan bahwa di titik tersebut laju dosis neutron didominasi oleh neutron epitermal sebesar 74,6%. Hasil ini menunjukkan bahwa metode aktivasi keping indium bisa menjadi metode alternatif yang praktis dan murah sebagai acuan atau referensi dalam pertimbangan tindakan proteksi radiasi neutron untuk pihak yang terkait.

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Advanced Postirradiation Characterization of Nuclear Fuels Using Pulsed Neutrons

Vogel

Bourke

Craft

et al. 2019

JOM

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Determination of the neutron energy spectrum of a radial neutron beam at a TRIGA reactor

Cited by 11 publications

References 12 publications

Neutron Beam Characterization at Neutron Radiography (NRAD) Reactor East Beam Following Reactor Modifications

Neutron Beam Characterization at Neutron Radiography (NRAD) Reactor East Beam Following Reactor Modifications

Pengukuran Laju Dosis Neutron Termal Dan Epitermal Di Tunnel Reaktor Serba Guna G. A Siwabessy Dengan Aktivasi Keping Indium

Advanced Postirradiation Characterization of Nuclear Fuels Using Pulsed Neutrons

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