Neutron spectrometry in mixed fields: multisphere spectrometers

Alevra, A.; Thomas, David J.

doi:10.1093/oxfordjournals.rpd.a006388

Cited by 99 publications

(60 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…malfunction of the equipment occurred during the measurements (11) . In the absence of measurements with the 9-inch sphere for all the locations, the 9-to 3-inch ratioa good measure of the neutron spectrum hardness (12) -could not be established.…”

Section: Resultsmentioning

confidence: 99%

Neutron measurements around storage casks containing spent fuel and vitrified high-level radioactive waste at ZWILAG

Buchillier

Aroua

Bochud

2007

Radiation Protection Dosimetry

View full text Add to dashboard Cite

Spectrometric and dosimetric measurements were made around a cask containing spent fuel and a cask containing high-level radioactive waste at the Swiss intermediate waste and spent fuel storage facility. A Bonner sphere spectrometer, an LB 6411 neutron monitor and an Automess Szintomat 6134A were used to characterise the n-g fields at several locations around the two casks. The results of these measurements show that the neutron fluence spectra around the cask containing radioactive waste are harder and higher in intensity than those measured in the vicinity of the spent fuel cask. The ambient dose equivalents measured with the LB 6411 neutron monitor are in good agreement with those obtained using the Bonner spheres, except for locations with soft neutron spectra where the monitor overestimates the neutron ambient dose equivalent by almost 50%.

show abstract

Section: Resultsmentioning

confidence: 99%

Neutron measurements around storage casks containing spent fuel and vitrified high-level radioactive waste at ZWILAG

Buchillier

Aroua

Bochud

2007

Radiation Protection Dosimetry

View full text Add to dashboard Cite

show abstract

“…The CNL BSS, shown in Fig. 3, consists of 7 polyethylene spheres and a SP9 [Centronic, Ltd, UK] 3 He spherical proportional counter with a nominal 3 He pressure of 2 atm (200 kPa) and additional 1 atm of Krypton stopping gas (Alevra, 1999;Alevra and Thomas, 2003). The process of neutron detection in the SP9 detector is based on large 3 He thermal neutron cross section (5330 barns) for the He(n, p) H 3 3 capture reaction.…”

Section: Instrumentationmentioning

confidence: 99%

“…The neutron spectra are generated through unfolding (de-convolution) process of these eight measurements using STAY'SL (Perey, 1977) and MAXED (MAXimum Entropy Deconvolution) (Reginatto and Goldhagen, 1999;Reginatto et al, 2002) FORTRAN coded algorithms. Both unfolding codes require a very sensible a priori (guess) spectrum (Alevra, 1999;Alevra and Thomas, 2003). The STAY'SL unfolding features, such as generation of uncertainties of the response functions and guess spectra, as well as covariance matrix (corresponding to response function matrix), are discussed in detail in our earlier paper on neutron metrology and dosimetry in research nuclear reactors (Atanackovic et al, 2013).…”

Section: Instrumentationmentioning

confidence: 99%

Characterization of neutron fields from bare and heavy water moderated 252Cf spontaneous fission source using Bonner Sphere Spectrometer

Atanackovic

Yonkeu

Dubeau³

et al. 2015

Applied Radiation and Isotopes

View full text Add to dashboard Cite

“…This system consists of several polyethylene spheres with different diameters and thermal neutron detector in their centers. BSS has basic advantages of isotropic response and cover a wide energy range from thermal up to several of MeV and easy operating [2][3][4][5][6]. An active detector of thermal neutron, usually proportional counter filled with 3 He or 3 BF detector, is placed at the center of these spheres.…”

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

View full text Add to dashboard Cite

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.

show abstract

Neutron spectrometry in mixed fields: multisphere spectrometers

Cited by 99 publications

References 0 publications

Neutron measurements around storage casks containing spent fuel and vitrified high-level radioactive waste at ZWILAG

Neutron measurements around storage casks containing spent fuel and vitrified high-level radioactive waste at ZWILAG

Characterization of neutron fields from bare and heavy water moderated 252Cf spontaneous fission source using Bonner Sphere Spectrometer

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

Contact Info

Product

Resources

About