A Single-Exposure, Multidetector Neutron Spectrometer for Workplace Monitoring

Bedogni, R.; Bortot, D.; Buonomo, B.; Esposito, A.; Gómez-Ros, J.M.; Introini, M.V.; Mazzitelli, G.; Moraleda, M.; Pola, A.; Romero, A. M.

doi:10.1093/rpd/ncv380

Cited by 12 publications

(5 citation statements)

References 13 publications

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“…An energy spectra measurement system was also set up for the validation of the unfolding capability by using a 252 Cf neutron source. The resultant unfolded 252 Cf source spectrum is in agreement with the results provided in the literature for neutron spectrometry 11 , 20 – 22 , 37 , 38 , 49 .…”

Section: Experiments and Methodssupporting

confidence: 87%

“…Albeit the complexity, some neutron spectrometry methods have been advanced such as proton recoil method 3 , time of flight measurements 4 , threshold detectors 5 , 3 He nested neutron spectrometer 2 , ultra-thin 3D silicon sensors 6 and multi-sphere methods. In particular, Bonner-type polyethylene (PE) spheres coupled with embedded thermal neutron detectors such as activation detectors 2 , 7 – 9 ; BF 3 or 3 He proportional counters 2 , 10 – 12 ; CR-39/ 10 B 13 – 16 ; bubble detectors 17 – 19 ; paired LiF TLDs 20 , 21 ; and thermal neutron pulsed detectors 22 , have been practical and well-adapted methods.…”

Section: Introductionmentioning

confidence: 99%

“…To fulfill such needs, some directional neutron spectrometry methods have been advanced such as: superheated emulsions at the center of one single 30 cm diameter nylon-6 moderating-sphere with a telescope-design wherein the detector views a narrow solid angle of about 1/6 steradians from an Am-Be source 19 ; multiple thermal neutron pulsed detectors in one moderating sphere exposed externally to Am-Be neutrons from different directions 22 ; three orthogonal 3 He tubes used inside a single high-density PE sphere exposed to Am-Be neutrons 12 , and design of an ultra-sensitive single cylindrical moderator directional neutron spectrometer based on seven 3 He detectors applied to low-fluence cosmic-ray-induced neutrons at ground level 24 . These advances are indeed strong supports to vital need to a simple passive multi-directional neutron spectrometry system.…”

Section: Introductionmentioning

confidence: 99%

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Photoneutron spectrometry by novel multi-directional spherical neutron spectrometry system

Sohrabi

Hakimi

2021

Sci Rep

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Neutron spectrometry in science and technology applications in general and accurate exotic photoneutron (PN) dosimetry of cancer patients undergoing high-dose high-energy X-rays therapy in medical accelerators in particular is of vital need. In this study, a novel passive multi-directional multi-detector neutron spectrometry system was developed and home-made using 6 polycarbonate/10B detectors on 6 sides of polyethylene (PE) cubes used bare and also embedded at center of PE spheres of 8 different diameters. The system provided well-resolved unfolded directional PN spectra showing thermal and fast PN peaks of 6 sides and mean spectrum in 5 field sizes at isocenter and other locations in 18 MV Siemens ONCOR medical linear accelerator bunker. The neutron spectrometry system developed has unique characteristics such as being simple, efficient, low cost, practical, and insensitive to low-LET radiation with well-resolved directional and mean spectra easily applicable in medicine, health, environment, science and technology in developing and developed laboratories.

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Section: Experiments and Methodssupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Photoneutron spectrometry by novel multi-directional spherical neutron spectrometry system

Sohrabi

Hakimi

2021

Sci Rep

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“…The idea of condensing the functionality of a Bonner Sphere Spectrometer in a single moderating device, embedding multiple thermal detectors in a specified geometry, was expressed in the past [1] but it needed about fifteen years to evolve in practical devices with real workplace applications. Two devices were developed during the present decade, namely the SP 2 (Spherical Spectrometer) [2][3][4] and the CYSP (CYlindrical SPectrometer) [5,6]. They were designed to cover the monitoring needs of different types of neutron-producing facilities.…”

Section: Introductionmentioning

confidence: 99%

CYSP-BEAM: A multi-detector directional spectrometer for in-beam neutron spectrometry

Bedogni

Gómez-Ros

Alikaniotis

et al. 2019

Nuclear Instruments and Methods in Physics Research Section A:

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CYSP-BEAM is a directional neutron spectrometer formed by a thick polyethylene cylindrical collimator followed by a sensitive capsule that contains several active thermal neutron detectors located at different depths along the cylindrical axis. Due to a thick lateral shield made of polyethylene and borated rubber, only neutrons from the direction identified by the collimating aperture can reach the internal detectors. As the response function of the internal detectors tend to peak at increasing energies as the detector depth increases, the device has spectrometric properties. This type of moderated spectrometer, whose prototype was the CYSP (CYlindrical SPectrometer), is capable to combine the functionalities of Bonner Spheres in a single device, thus requiring only one exposure to measure all the energy components of the incident beam, from thermal up to GeV neutrons. The neutron spectrum is obtained via few-channel unfolding methods. With respect to the original CYSP, the new CYSP-BEAM device is optimized to operate in the direct intense beam of neutron producing installations, such as large scale neutron science facilities. Compared with CYSP, CYSP-BEAM has narrower collimating aperture and the internal detectors have sensibility a factor 100 lower. Its response matrix was simulated using MCNPX. This paper describes the new device focusing on the internal detectors, the response matrix and the test measurement performed using the 14 MeV beam produced at the ENEA Frascati Neutron Generator (FNG).

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“…CYSP-BEAM spectrometer [1] belongs to a class of "single moderator neutron spectrometers" [2,3] that condense the functionality of a Bonner spheres spectrometer in a single moderator embedding multiple thermal neutron detectors. In these instruments the neutron spectrum is obtained via few-channel unfolding [4].…”

mentioning

confidence: 99%

Thermal to GeV neutron spectrometry of the INES beam line at ISIS using the CYSP-BEAM spectrometer

Bedogni

Gómez-Ros

Scherillo

et al. 2019

EPL

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The neutron energy distribution of the INES beam line, extending from thermal up to nearly 800 MeV, was measured by means of the CYSP-BEAM broad energy range spectrometer. The latter is an innovative type of moderator-based directional neutron spectrometer, based on multiple thermal neutron detectors embedded in a collimated cylindrical structure. Its operation principle is the same as the Bonner sphere spectrometer (BSS), but only one exposure is needed to simultaneously determine all energy components. This paper describes the performance of the spectrometer, from the response of the internal thermal neutron detectors to the spectrum unfolding. This paper opens the way for a new generation of real-time spectrometric devices for quality assurance of neutron beamlines.

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A Single-Exposure, Multidetector Neutron Spectrometer for Workplace Monitoring

Cited by 12 publications

References 13 publications

Photoneutron spectrometry by novel multi-directional spherical neutron spectrometry system

Photoneutron spectrometry by novel multi-directional spherical neutron spectrometry system

CYSP-BEAM: A multi-detector directional spectrometer for in-beam neutron spectrometry

Thermal to GeV neutron spectrometry of the INES beam line at ISIS using the CYSP-BEAM spectrometer

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