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Radiation Protection Dosimetry Advance Access originally published online on May 11, 2007
Radiation Protection Dosimetry 2007 126(1-4):8-12; doi:10.1093/rpd/ncm004
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© The Author 2007. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Construction of monoenergetic neutron calibration fields using 45Sc(p, n)45Ti reaction at JAEA

Y. Tanimura*, J. Saegusa, Y. Shikaze, M. Tsutsumi, S. Shimizu and M. Yoshizawa

Department of Radiation Protection, Nuclear Science Research Institute, Japan Atomic Energy Agency, Tokaimura, Ibaraki, 319-1195, Japan

* Corresponding author: tanimura.yoshihiko{at}jaea.go.jp

The 8 and 27 keV monoenergetic neutron calibration fields have been developed by using 45Sc(p, n)45Ti reaction. Protons from a 4-MV Pelletron accelerator are used to bombard a thin scandium target evaporated onto a platinum disc. The proton energies are finely adjusted to the resonance to generate the 8 and 27 keV neutrons by applying a high voltage to the target assemblies. The neutron energies were measured using the time-of-flight method with a lithium glass scintillation detector. The neutron fluences at a calibration point located at 50 cm from the target were evaluated using Bonner spheres. A long counter was placed at 2.2 m from the target and at 60° to the direction of the proton beam in order to monitor the fluence at the calibration point. Fluence and dose equivalent rates at the calibration point are sufficient to calibrate many types of the neutron survey metres.


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