The IAEA-375 material (top soil to a depth of 20 cm) was obtained from the “Staryi Viskov” collective farm in Novozybkov, Brjansk, Russia, in July 1990. The material was air dried and milled to give a grain size less than 0.3 mm by the Brjansk Centre for Agricultural Radiology and Chemistry and dispatched for further processing to the IAEA Laboratories, Seibersdorf, in November 1990. This material was γ-sterilized to ensure long-term stability of the material by inhibiting microbial action.
Reference date for decay correction: 1991-12-31
| Analyte | Value | Unit | 96% C.I. | N | R/I/C |
| 106Ru | 56 | Bq/kg | 53 – 58 | 26 | R |
| 125Sb | 77 | Bq/kg | 74 – 79 | 38 | R |
| 129I | 0.0017 | Bq/kg | 0.0013 – 0.0021 | 10 | R |
| 134Cs | 463 | Bq/kg | 454 – 472 | 87 | R |
| 137Cs | 5280 | Bq/kg | 5200 – 5360 | 91 | R |
| 226Ra | 20 | Bq/kg | 18 – 22 | 37 | R |
| 228Th | 21 | Bq/kg | 17 – 25 | 6 | I |
| 232Th | 20.5 | Bq/kg | 19.2 – 21.9 | 11 | R |
| 234U | 25 | Bq/kg | 17 – 32 | 5 | I |
| 238Pu | 0.071 | Bq/kg | 0.056 – 0.085 | 10 | I |
| 238U | 24.4 | Bq/kg | 19.0 – 29.8 | 7 | I |
| 239+240Pu | 0.3 | Bq/kg | 0.26 – 0.34 | 20 | I |
| 241Am | 0.13 | Bq/kg | 0.11 – 0.15 | 6 | I |
| 40K | 424 | Bq/kg | 417 – 432 | 84 | R |
| 90Sr | 108 | Bq/kg | 101 – 114 | 43 | R |
| As | 2.56 | mg/kg | 2.24 – 2.88 | 6 | I |
| Ba | 335 | mg/kg | 316 – 354 | 6 | I |
| La | 17.6 | mg/kg | 15.3 – 19.9 | 5 | I |
| Ni | 9.7 | mg/kg | 7.9 – 11.6 | 5 | I |
| Rb | 48 | mg/kg | 44 – 52 | 8 | I |
| Th | 5.2 | mg/kg | 5.0 – 5.4 | 26 | R |
| U | 1.86 | mg/kg | 1.66 – 2.05 | 30 | R |
| Yb | 1.73 | mg/kg | 1.24 – 2.22 | 5 | I |
(Value) Concentration calculated as a mean of the accepted laboratory means
(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).
