The raw material used for production of IAEA-478 was collected from a sampling area near Gyömrő, Hungary (E19.22625 N47.23724) and the soil has one of the lowest radionuclide contents in the region. The raw material was spiked with radionuclides, using dilutions of high precision radioactive certified reference solutions from metrological institutes. After spiking, it was homogenised and tested for heterogeneity. The grain size distribution of the material is between 150 and 250 µm.
Reference date for all specified radionuclide decay corrections: 01 January 2018
Certified values for activity concentration (based on dry mass)
| Radionuclide | Certified value [Bq kg-1] | Uncertainty [Bq kg-1] (a) | Half-life |
| 40K | 374 | 15 | 1.2504 (30) ×109 years |
| 60Co | 142 | 2 | 5.2711 (8) years |
| 133Ba | 56.8 | 0.7 | 10.539 (6) years |
| 134Cs | 112.2 | 1.4 | 2.0644 (14) years |
| 137Cs | 65.0 | 0.9 | 30.05 (8) years |
| 210Pb | 485 | 10 | 22.23 (12) years |
| 241Am | 53.1 | 0.7 | 432.6 (6) years |
(a) The uncertainty is expressed as a combined standard uncertainty (coverage factor k = 1).
Information values for activity concentration (based on dry mass)
| Radionuclide | Information value [Bq kg-1] | Uncertainty [Bq kg-1] (a) | Half-life |
Th-series
| | | |
| 232Th | 32.6 | 0.8 | 14.02 (6) × 109 years |
| 228Ra | 32.6 | 0.8 | 5.75 (4) years |
| 228Ac | 32.6 | 0.8 | 6.15 (3) hours |
| 228Th | 32.6 | 0.8 | 1.9126 (9) years |
U-series
| | | |
| 238U | 25.0 | 1.7 | 4.468 (5) × 109 years |
| 234U | 25.0 | 1.7 | 2.455 (6) × 105 years |
| 226Ra | 31.2 | 1.5 | 1600 (6) years |
(a) The uncertainty is expressed as a combined standard uncertainty (coverage factor k = 1)
