Characterisation of the high-energy neutron beam at iThemba LABS

Since the discovery of the neutron in 1934 neutron beams have been used in a very broad range of applications, As an aging fleet of nuclear reactor sources is retired the use of compact accelerator-driven neutron sources (CANS) are becoming more prevalent. CANS are playing a significant and expanding role in research and development in science and engineering, as well as in education and training. In the realm of multidisciplinary applications, CANS offer opportunities over a wide range of technical utilization, from interrogation of civil structures to medical therapy to cultural heritage study. This paper aims to provide the first comprehensive overview of the history, current status of operation, and ongoing development of CANS worldwide. The basic physics and engineering regarding neutron production by accelerators, target-moderator systems, and beam line instrumentation are introduced, followed by an extensive discussion of various evolving applications currently exploited at CANS.

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“…The iTL facility has been used for detector development, cross section measurements, and radiation biology experiments. [41] …”

Section: Ithemba In South Africamentioning

confidence: 99%

Research opportunities with compact accelerator-driven neutron sources

et al. 2016

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“…The characterisation of the spectral fluence distribution was performed by combining data from a NE213 scintillator and parallel-plate 238 U fission chamber (1) . The relative neutron energy spectra were determined using the NE213 detector via time-of-flight measurements, and the fluence using the fission chamber.…”

Section: Methods For Beam Characterisationmentioning

confidence: 99%

“…A separated-sector cyclotron accelerates protons in the energy range from 25 to 200 MeV (1) . The 7 Li( p, n) 7 Be reaction is employed to produce neutrons up to 200 MeV.…”

Section: Layout Of Beam Delivery Systemmentioning

confidence: 99%

A comparison of the response of PADC neutron dosemeters in high-energy neutron fields

Trompier¹,

Boschung

Buffler

et al. 2013

Radiation Protection Dosimetry

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Within the framework of the EURADOS Working Group 11, a comparison of passive neutron dosemeters in high-energy neutron fields was organised in 2011. The aim of the exercise was to evaluate the response of poly-allyl-glycol-carbonate neutron dosemeters from various European dosimetry laboratories to high-energy neutron fields. Irradiations were performed at the iThemba LABS facility in South Africa with neutrons having energies up to 66 and 100 MeV.

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“…A quasi-monoenergetic neutron emission, which is strongly forward peaked, is obtained in this way. 20 A 2.00 m thick steel collimator with openings at 0° and 16° shapes 8 × 8 cm 2 beams at 6.00 m. The collimator is lined on the outside by a layer of borated wax and polyethylene. A cleaning magnet deflects proton beams into the well-shielded beam stop where a Faraday cup measures the beam current.…”

Section: Measurements With a 140 Mev Proton Beammentioning

confidence: 99%

A new compact neutron/gamma ray scintillation detector

Buffler

Comrie

Smit

et al. 2016

Int. J. Mod. Phys. Conf. Ser.

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Progress towards the realization of a new compact neutron spectrometer is described. The detector is based on EJ299-33 plastic scintillator coupled to silicon photomultipliers, and a digital implementation of pulse shape discrimination is used to separate events associated with neutrons from those associated with gamma rays. The spectrometer will be suitable over the neutron energy range 1-100 MeV, illustrated in this work with measurements made using an AmBe radioisotopic source and quasi-monoenergetic neutron beams produced using a cyclotron.

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Characterisation of the high-energy neutron beam at iThemba LABS

Cited by 30 publications

References 8 publications

Research opportunities with compact accelerator-driven neutron sources

Research opportunities with compact accelerator-driven neutron sources

A comparison of the response of PADC neutron dosemeters in high-energy neutron fields

A new compact neutron/gamma ray scintillation detector

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