JAEA-Technology-2010-005.pdf:2.44MB - 日本原子力研究開発機構

JAEA-Technology 2010-005
Establishment of Soft X-ray Reference Fields for Performance Tests of
Radiation Measuring Instruments Based on National Standard
Shigeru SHIMIZU, Katsutoshi FUJII and Tomokatsu KAWASAKI +
Department of Radiation Protection
Nuclear Science Research Institute
Tokai Research and Development Center
Japan Atomic Energy Agency
Tokai-mura, Naka-gun, Ibaraki-ken
(Received January 26 , 2010)
In the Japanese Industrial Standard, JIS Z 4511 sets the condition of X-ray reference fields to
be used for the performance test of radiation measuring instruments for radiation protection.
With the soft X-ray generator installed in the Facility of Radiation Standards in Nuclear Science
Research Institute, we have established four series of soft X-ray reference fields with quality
index of 0.6, 0.7, 0.8 and 0.9 based on JIS Z 4511. In this article, quality of the X-ray fields,
X-ray spectra, conversion coefficients to the dose equivalents from Air-Kerma were evaluated in
the soft X-ray fields produced with X-ray tube voltage ranging from 6kV to 100kV, and set soft
X-ray reference fields based on Japanese Industrial Standard about 42 qualities. As a result,
this X-ray reference fields met a domestic setting condition well and precision was good for
conversion factors to various dose equivalents from Air- Kerma and we confirmed the soundness
of the spectrum of each X-ray quality. By this, it is found that dose equivalent standard with
good precision and wide range of test energy points and dose rates can be provided, for the
performance tests such as the energy characteristic and the direction characteristic for various
radiation instruments.
Keywords: X-ray Reference Field, Radiation Measuring Instrument, JIS Z 4511,
Half Value Layer, Quality Index, X-ray Energy Spectra, Calibration,
Effective Energy, National Standard,
+:Health and Safety Department, Oarai Research and Development Center
ii