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Radiation Protection Dosimetry 2004 110(1-4):85-89; doi:10.1093/rpd/nch197
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Radiation Protection Dosimetry Vol. 110 Nos. 1-4 © Oxford University Press 2004; all rights reserved

Construction of 144, 565 keV and 5.0 MeV monoenergetic neutron calibration fields at JAERI

Y. Tanimura1, M. Yoshizawa1, J. Saegusa1, K. Fujii1, S. Shimizu1, M. Yoshida1, Y. Shibata2, A. Uritani2 and K. Kudo2

1 Japan Atomic Energy Research Institute, Tokai-mura, Naka-gun, Ibaraki, 319-1195, Japan
2 National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki, 305-8563, Japan

* Corresponding author: tanimura{at}popsvr.tokai.jaeri.go.jp

Monoenergetic neutron calibration fields of 144, 565 keV and 5.0 MeV have been developed at the Facility of Radiation Standards of JAERI using a 4 MV Pelletron accelerator. The 7Li(p,n)7Be and 2H(d,n)3He reactions are employed for neutron production. The neutron energy was measured by the time-of-flight method with a liquid scintillation detector and calculated with the MCNP-ANT code. A long counter is employed as a neutron monitor because of the flat response. The monitor is set up where the influence of inscattered neutrons from devices and their supporting materials at a calibration point is as small as possible. The calibration coefficients from the monitor counts to the neutron fluence at a calibration point were obtained from the reference fluence measured with the transfer instrument of the primary standard laboratory (AIST), a 24.13 cm {phi} Bonner sphere counter. The traceability of the fields to AIST was established through the calibration.


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