Determination of workplace neutron spectra at a high energy hadron accelerator using active and passive Bonner sphere spectrometers

Bedogni, R.; Esposito, A.; Chiti, M.

doi:10.1016/j.radmeas.2007.10.011

Cited by 12 publications

(4 citation statements)

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“…Among different tools for measurements of neutron spectra in such environment the simplest and the most common technique is to use the Bonner sphere spectrometer (BSS) [2][3][4]. The BSS typically consists of thermal neutron sensitive detectors placed within moderator spheres or cylinders of different thicknesses.…”

Section: Introductionmentioning

confidence: 99%

Neutron spectra at a high energy heavy ion accelerator measured with a TLD-based Bonner spectrometer.

et al. 2021

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A Bonner sphere spectrometer with TLD cards as sensitive elements was constructed and used at the GSI accelerator complex to measure the neutron spectral fluence rates for radiation safety purposes. The neutron spectra were measured in the synchrotron tunnel during 550 MeV/u 40Ar beam operation and in Cave A experimental area with a 1 GeV/u 56Fe beam impinging on a thick aluminum target. Unfolded spectra were compared with those calculated using the Monte Carlo code FLUKA. The measured spectra show a good agreement with the simulations and the set proved itself to be a useful tool for different radiation safety purposes.

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Section: Introductionmentioning

confidence: 99%

Neutron spectra at a high energy heavy ion accelerator measured with a TLD-based Bonner spectrometer.

et al. 2021

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“…Here the photon signal may account for a large fraction of the thermoluminescent signal, and small uncertainties in the TL readings could lead to a large uncertainty in the determination of the neutron signal. TLD pairs have been used in medical electron LINACs in off-axis areas (30,51) and around high-energy particle accelerators, where their results were comparable with those obtained with a 6 Li(Eu) scintillator (31) .…”

Section: Passive Detectorsmentioning

confidence: 75%

“…-Different types of thermal neutron detectors can be used as the central sensor of the BSS. At INFN-LNF the same set of spheres, including three extended range spheres, has been used with a 6 LiI(Eu) scintillator (28,29) , TLD pairs (30,31) and gold (30,32) or dysprosium activation foils (33,34) for measurements in particle accelerators under different conditions of intensity, time structure and intensity of the photon fields. An appropriate choice of the thermal detector may allow the BSS to work correctly even in the presence of very intense photon fields as in electron accelerators.…”

Section: Introductionmentioning

confidence: 99%

Neutron spectrometry with Bonner Spheres for area monitoring in particle accelerators

Bedogni

2011

Radiation Protection Dosimetry

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Selecting the instruments to determine the operational quantities in the neutron fields produced by particle accelerators involves a combination of aspects, which is peculiar to these environments: the energy distribution of the neutron field, the continuous or pulsed time structure of the beam, the presence of other radiations to which the neutron instruments could have significant response and the large variability in the dose rate, which can be observed when moving from areas near the beam line to free-access areas. The use of spectrometric techniques in support of traditional instruments is highly recommended to improve the accuracy of dosimetric evaluations. The multi-sphere or Bonner Sphere Spectrometer (BSS) is certainly the most used device, due to characteristics such as the wide energy range, large variety of active and passive detectors suited for different workplaces, good photon discrimination and the simple signal management. Disadvantages are the poor energy resolution, weight and need to sequentially irradiate the spheres, leading to usually long measurement sessions. Moreover, complex unfolding analyses are needed to obtain the neutron spectra. This work is an overview of the BSS for area monitoring in particle accelerators.

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“…TLD pairs (Barquero et al, 2005;Howell et al, 2005;Bedogni et al, 2008a) or gold activation foils (Thomas et al, 2007;Fernández et al, 2007;Bedogni et al, 2008b) have been frequently used as central detectors for passive BSS. Whilst TLDs are in general more sensitive, gold foils are most suited for workplaces with high photon component because of their insensitivity to photons.…”

Section: Introductionmentioning

confidence: 99%

Design and experimental validation of a Bonner Sphere Spectrometer based on Dysprosium activation foils

Bedogni

Ferrari

Gualdrini

et al. 2010

Radiation Measurements

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Determination of workplace neutron spectra at a high energy hadron accelerator using active and passive Bonner sphere spectrometers

Cited by 12 publications

References 12 publications

Neutron spectra at a high energy heavy ion accelerator measured with a TLD-based Bonner spectrometer.

Neutron spectra at a high energy heavy ion accelerator measured with a TLD-based Bonner spectrometer.

Neutron spectrometry with Bonner Spheres for area monitoring in particle accelerators

Design and experimental validation of a Bonner Sphere Spectrometer based on Dysprosium activation foils

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