Convenient Method of Relative Calibration of the Neutron Source Emission Rate Between Different Source Types

Harano,; Matsumoto, Tadahiko; Shimoyama,; Satô,; Uritani,; Hino,; Kudo,; Michikawa,

doi:10.1109/nssmic.2005.1596307

Cited by 5 publications

(7 citation statements)

References 12 publications

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“…The 252 Cf source itself is encapsulated in a type-X1 stainless steel capsule with a nominal activity of 200 MBq. Its neutron emission rate was calibrated by means of a relative measurement against a standard 241 Am-Be source calibrated by the National Physical Laboratory in the UK [5]. The tank is 30 cm in diameter and weighs approximately 20 kg when it is filled with heavy water.…”

Section: Source Assemblymentioning

confidence: 99%

Development of a neutron standard field using a heavy-water moderated 252Cf source at NMIJ-AIST

Masuda¹,

Harano²,

Matsumoto³

et al. 2014

Progress in Nuclear Science and Technology

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A neutron standard field using a heavy-water moderated 252 Cf source has been developed at the National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology. It can produce an energy distribution consisting of a remaining spontaneous fission spectrum and a slowing-down continuum to the low-energy region, which is similar to that present in real workplaces at nuclear facilities. The heavy-water moderated 252 Cf source and irradiation system includes shadow cones for measurements of scattered neutrons, and was designed using Monte-Carlo simulations based on the MCNPX code. The field was characterized using detector measurements and the results were compared to calculations. A fluence measurement was performed using a 6" Bonner sphere detector and the result agreed with the calculation to within the experimental uncertainty. In addition, a spectral measurement was carried out using a Bonner sphere spectrometer and the unfolding method and the unfolded spectrum was found to be in good agreement with the calculated spectrum.

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Section: Source Assemblymentioning

confidence: 99%

Development of a neutron standard field using a heavy-water moderated 252Cf source at NMIJ-AIST

Masuda¹,

Harano²,

Matsumoto³

et al. 2014

Progress in Nuclear Science and Technology

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“…Thick radiator detector 8.0 MeV 9 Be( ,n) 12 C neutrons using the Van de Graaff accelerator 10,11) .…”

Section: Neutron Fluence Standard At 25mevmentioning

confidence: 99%

“…Relative calibration to the standard source by measuring the thermal neutron fluence rate in the graphite pile 12) .…”

Section: Neutron Fluence Standard At 25mevmentioning

confidence: 99%

“…241 Am-Be standard source the transition to the ground and first excited states of their residual 12 C nuclei and the contribution of the 3.5 MeV neutrons will be subtracted in actual calibrations 10) . The neutron fluence is determined using the TR detector with a dE-E configuration, incorporating a thin transmission-type silicon detector (dE) with a 50 mm depletion depth sandwiched between a 1 mm thick polyethylene radiator disk and a silicon detector (E) with a 2 mm depletion depth.…”

Section: Neutron Fluence Standard At 25mevmentioning

confidence: 99%

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Recent activities on neutron standardization in Japan

Harano

Matsumoto

Nishiyama

et al. 2011

Progress in Nuclear Science and Technology

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NMIJ provides national standards on neutron fluence as well as neutron emission rate in Japan. The neutron fluence standards are established for thermal neutrons, monoenergetic neutrons at seven energies from 24 keV to 14.8 MeV, radionuclide-source neutrons from 252 Cf and 241 Am-Be. The neutron emission standards are provided for these radionuclide sources. These are basically prepared in accordance with ISO 8529-1. Worldwide consistency of the standards has been supported by participating in key comparisons organized by BIPM. NMIJ issues calibration certificates accepted worldwide within the range specified in our calibration and measurement capabilities listed in the BIPM web page. The development of the 19 MeV neutron field is in progress to complete standardization in 2011. The radionuclide-source neutron fluence standards were extended in 2008 so that calibrations are also available in terms of ambient/personal dose equivalent. The Japan calibration service system has launched to improve the traceability of neutron measurement in Japan. A new thermal neutron calibration field is developing with a guided beam at the research reactor JRR-3M of JAEA. Aiming at the establishment of the 20-100 MeV high-energy neutron standard, comparison studies are currently being conducted between the cyclotron facilities TIARA of JAEA and CYRIC of the Tohoku University.

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“…Thermal neutrons are produced in various ways. Most sources are obtained by slowing down fast neutrons from a radionuclide source [1,2] or a nuclear reaction with an accelerator [3] in a moderator material such as a graphite pile or a polyethylene block. Thermal neutrons extracted from a research reactor [4][5][6] are also used as a source.…”

Section: Introductionmentioning

confidence: 99%

Development of two-dimensional differential calibration method for a neutron dosimeter using a thermal neutron beam

Matsumoto

Harano

Masuda

et al. 2010

IEEE Nuclear Science Symposuim &Amp; Medical Imaging Conference

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We developed a new thermal neutron calibration method to be able to experimentally determine an energy response function of a neutron detector using a pulse parallel beam and the time-of-flight (TOF) technique. The calibration method was experimentally demonstrated for a 3 He proportional counter and an electric personal dosimeter using a pulsed thermal neutron beam from the research reactor, JRR-3M. The responses of the detectors were successfully obtained as a function of the neutron energy. To solve the point at issue for the calibration method, we also propose an idea of an improved calibration method using a pulsed narrow beam, the TOF technique and a beam scanning technique. The improved calibration method does not require detailed information of the detector structure.

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Convenient Method of Relative Calibration of the Neutron Source Emission Rate Between Different Source Types

Cited by 5 publications

References 12 publications

Development of a neutron standard field using a heavy-water moderated 252Cf source at NMIJ-AIST

Development of a neutron standard field using a heavy-water moderated 252Cf source at NMIJ-AIST

Recent activities on neutron standardization in Japan

Development of two-dimensional differential calibration method for a neutron dosimeter using a thermal neutron beam

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