After the Fukushima disaster, various types of instruments for determination of radioactive contaminants in foods were installed in whole areas of Japan.  This requires development of the standard reference materials certified with the proper procedure for quality control. Our group started a short-term project supported by Japan Science and Technology Agency for development of the certified standard materials of foods and soils.  The candidate materials were contaminated with radioactivity from the Fukushima incident.  Preparation of the certified reference material of brown rice grain was completed in late August before the harvest season in Far East.  Concentration of radiocesium was controlled as close to 100 Bq/kg which is the 'threshold' for distribution of rice in local market.  The standard has been distributed by Japan Society for Analytical Chemistry which authorizes the certification procedure.  Preparation of the reference standards of soybean and beef are now in progress.

Preparation of certified reference materials for determination of radioactivity in foods and soils

245th National Meeting (2013)

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