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IAEA-464Brown Rice Grains, 200g (temp. not available)
发布时间：2020/11/13 7:23:50 浏览次数：1106
IAEA-464Brown Rice Grains, 200g (temp. not available)
Organic Vegetation
The raw material was collected by the Japanese food control authorities. The material was homogenized in one lot using a large volume, low speed homogenizer in the Radioanalytical Reference Laboratory (RRL) of the Food and Feed Safety Directorate in Hungary. To avoid any abrasion of the outside layers of the grains, the samples are sealed in vacuum bags. The packing unit is 200g, which is enough for 100-200 cm3 cylindrical geometry.
Certified values for massic activities (based on dry mass)
Reference date for decay correction: 1 January 2015Radionuclide Certified value [Bq kg-1] Uncertainty* [Bq kg-1] Half life 40K 72.1 3.2 [1.2504(30)]x109 years 134Cs 12.0 0.4 2.0644(14) years 137Cs 38.6 0.8 30.05(8) years * The uncertainty is expressed as a combined standard uncertainty with a coverage factor k = 1 estimated in accordance with the JCGM 100:2008 Evaluation of measurement data – Guide to the expression of uncertainty in
