The IAEA-313 stream sediment sample was collected from the Sibolga area of the west coast of northern Sumatra, Indonesia. This material was γ-sterilized to ensure long-term stability of the material by inhibiting microbial action.
Reference date for decay correction: 1988-01-30
| Analyte | Value | Unit | 95% C.I. | N | R/I/C |
| 226Ra | 343 | Bq/kg | 307 – 379 | 24 | R |
| Th | 77.1 | mg/kg | 74.8 – 79.4 | 23 | R |
| U | 18.2 | mg/kg | 17.0 – 19.3 | 31 | R |
(N) Number of accepted laboratory means which are used to calculate the recommended or information values and their respective confidence intervals
(R/I/C) Classification assigned to the property value for analyte (Recommended/Information/Certified)
The values listed above were established on the basis of statistically valid results submitted by laboratories which had participated in one or more international interlaboratory comparisons organized by the Chemistry Unit, IAEA Laboratories, Seibersdorf. The details concerning the criteria for qualification as a recommended or information value can be found in the respective report (attached).
