Neutron Spectral Measurements at ORNL

Liu, J.C.; Hajnal, F.; Sims, Christopher E.; Kuiper, J.

doi:10.1093/oxfordjournals.rpd.a080615

Cited by 11 publications

(2 citation statements)

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“…The calibration of the BS was performed in the neutron irradiation room at KAERI using the 252 Cf source, which had been calibrated by a traceable source at the National Institute of Standards and Technology, USA. This calibration technique for an active BS was the same as that done by Liu et al (10) Calibration results were consistent with the reference, the dosimetric quantities of a 252 Cf source recommended by ISO (11) , as shown in Table 1. In case of a passive BS only one distance of 40 cm from the 252 Cf source was used to get the possible irradiation time for an Au foil due to the relatively low neutron emission rate, which is $1.06 Â 10 8 n s À1 at the time of calibration.…”

Section: Spectrum Unfolding and Calibration Of An Extended Bssupporting

confidence: 83%

Measurement of the neutron fluence and dose spectra using an extended bonner sphere and a tissue-equivalent proportional counter

Bh¹,

Chang²,

Hs³

et al. 2004

Radiation Protection Dosimetry

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A conventional Bonner Sphere (BS) set consisting of six polyethylene spheres was modified to enhance its response to a high-energy neutron by putting a lead shell inside a polyethylene moderator. The response matrix of an extended BS was calculated using the MCNPX code and calibrated using a 252Cf neutron source. In order to survey the unknown photon and neutron mixed field, a spherical tissue equivalent proportional counter (TEPC) was constructed and assembled as a portable measurement system. The extended BS and the self-constructed TEPC were employed to determine the dosimetric quantities of the neutron field produced from the thick lead target bombarded by the 2.5 GeV electron beam of Pohang Accelerator Laboratory (PAL) and the neutron calibration field of Korea Atomic Energy Research Institute (KAERI).

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Section: Spectrum Unfolding and Calibration Of An Extended Bssupporting

confidence: 83%

Measurement of the neutron fluence and dose spectra using an extended bonner sphere and a tissue-equivalent proportional counter

Bh¹,

Chang²,

Hs³

et al. 2004

Radiation Protection Dosimetry

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“…:FTC-CF-Z270) which had been calibrated by a traceable source at the National Institute of Standards and Technology, U.S.A. These calibration techniques were the same as the way done by Liu et al (9) A comparison between the free field spectrum (measured) and the reference 252Cfl) spectrum is shown in Fig. 1.…”

Section: Spectral Unfolding and Calibration Of Bmssmentioning

confidence: 99%

Scattered Neutron Calibration Fields of KAERI

Kim

Chang

et al. 2000

Journal of Nuclear Science and Technology

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Some scattered neutron fields for the calibration of personal dosemeters and survey meters used for radiation protection purpose were constructed in the Radiation Calibration Laboratory (RCL) of Korea Atomic Energy Research Institute (KAERI). The radionuclide sources of 252 Cf and 24IAmBe were used for producing the neutron calibration fields with not so much different method recommended by ISO. The calibration points of interest were behind the shadow objects and the concrete wall in the irradiation room. In order to characterize the neutron calibration fields at the point of test, the spectral neutron fluence rate was determined by means of the Bonner Multi-sphere Spectrometry System (BMSS) and the measured spectra unfolded using the BUNKI code, This paper shows the dosimetric data available for calibration and the feasibility of use as the Realistic Neutron Calibration Fields (RNCF) of KAERL

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