Based on experience with this material since its release and stability monitoring, the extended expiry date is January 2025. 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.
Reference date for all specified radionuclide decay corrections: 01 January 2015
Certified values for activity concentration (based on dry mass)
| Radionuclide | Certified value[a] [Bq kg⁻¹] | Uncertainty[b] [Bq kg⁻¹] | Half life |
| ⁴⁰K | 72.1 | 3.2 | 1.2504(30)x109 years |
| ¹³⁷Cs | 38.6 | 0.8 | 30.05(8) years |
(a) Certified values are calculated from the accepted data sets, each being obtained by a different laboratory following ISO Guide 35.
(b) The uncertainty is expressed as a combined standard uncertainty (coverage factor k = 1) estimated in accordance with the JCGM 100:2008 and ISO Guide 35.
Information values for activity concentration (based on dry mass)
| Radionuclide | Information value[a] [Bq kg⁻¹] | Uncertainty[b] [Bq kg⁻¹] | Half life |
| ¹³⁴Cs | 12.0 | 0.4 | 2.0644(14) years |
(a) Information values are calculated from the accepted data sets, each being obtained by a different laboratory following ISO Guide 35.
(b) The uncertainty is expressed as a combined standard uncertainty (coverage factor k = 1) estimated in accordance with the JCGM 100:2008 and ISO Guide 35.
