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Radiation Protection Dosimetry Advance Access published online on May 24, 2005
Radiation Protection Dosimetry, doi:10.1093/rpd/nch499
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oupjournals.org
Received January 13, 2005
Revised April 15, 2005
Accepted April 23, 2005

SCIENTIFIC AND TECHNICAL PAPER

DIFFERENTIAL ABSORBED DOSE DISTRIBUTIONS IN LINEAL ENERGY FOR NEUTRONS AND GAMMA RAYS AT THE MONO-ENERGETIC NEUTRON CALIBRATION FACILITY

M. Takada 1*, M. Baba 2, H. Yamaguchi 1, and K. Fujitaka 1

1 National Institute of Radiological Sciences, Chiba 263-8555, Japan
2 Cyclotron and Radioisotope Center, Tohoku University, Sendai 980-8579, Japan

* To whom correspondence should be addressed.
M. Takada, E-mail: m_takada{at}nirs.go.jp


  Abstract

Absorbed dose distributions in lineal energy for neutrons and gamma rays of mono-energetic neutron sources from 140 keV to 15 MeV were measured in the Fast Neutron Laboratory at Tohoku University. By using both a tissue-equivalent plastic walled counter and a graphite-walled low-pressure proportional counter, absorbed dose distributions in lineal energy for neutrons were obtained separately from those for gamma rays. This method needs no knowledge of energy spectra and dose distributions for gamma rays. The gamma-ray contribution in this neutron calibration field >1 MeV neutron was <3%, while for <550 keV it was >40%. The measured neutron absolute absorbed doses per unit neutron fluence agreed with the LA150 evaluated kerma factors. By using this method, absorbed dose distributions in lineal energy for neutrons and gamma rays in an unknown neutron field can be obtained separately.


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