National Metrology Institute of Japan
Characterization of gamma rays existing in the NMIJ standard neutron field
Abstract
Our laboratory provides national standards on fast neutron fluence. Neutron fields are always accompanied by gamma rays produced in neutron sources and surroundings. We have characterised these gamma rays in the 5.0 MeV standard neutron field. Gamma ray measurement was performed using an NE213 liquid scintillator. Pulse shape discrimination was incorporated to separate the events induced by gamma rays from those by neutrons. The measured gamma ray spectra were unfolded with the HEPRO program package to obtain the spectral fluences using the response matrix prepared with the EGS4 code. Corrections were made for the gamma rays produced by neutrons in the detector assembly using the MCNP4C code. The effective dose equivalents were estimated to be of the order of 25 microSv at the neutron fluence of 10(7) neutrons cm(-2).
Source and rights
Published by Radiation protection dosimetry, 2004. The guideline itself is at the source linked here.
Prognia summarises this guideline for reference and education. It is not medical advice. Always check the official guideline and current local protocols before acting on it.
At a glance
- Organisation
- National Metrology Institute of Japan
- Published
- 2004
- Applies to
- 🇯🇵 Japan
- Scope
- National
- Journal
- Radiation protection dosimetry
- PubMed
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