IAEA-RGTh-1 , Thorium Ore
Inorganic , Ores
- Unit Size: 500g
- Price per Unit: 50 EUR
- Report: IAEA/RL/148
- Date of Release: 1987-01-01
- Producing Laboratory: email
Both, IAEA-RGU-1 and IAEA-RGTh-1 reference materials were prepared on behalf of the International Atomic Energy Agency by the Canada Centre for Mineral and Energy Technology by dilution of a uranium ore BL-5 (7.09% U) and a thorium ore OKA-2 (2.89% Th, 219 μg U/g) with floated silica powder of similar grain size distribution, respectively. No evidence for between-bottles inhomogeneity was detected after mixing and bottling. BL-5 has been certified for uranium, 226Ra and 210Pb confirming that it is in radioactive equilibrium. The agreement between radiometric and chemical measurements of thorium and uranium in OKA-2 shows both series to be in radioactive equilibrium.
| Analyte | Value | Unit | 95% C.I. | N | R/I/C |
|---|---|---|---|---|---|
| 232Th | 3250? | Bq/kg | 3160 - 3340 | 155 | R |
| 235U | 3.6? | Bq/kg | 3.3 - 3.9 | 145 | R |
| 238U | 78? | Bq/kg | 72 - 84 | 145 | R |
| 40K | 6.3? | Bq/kg | 3.1 - 9.5 | 45 | I |
| K | 200 | mg/kg | 100 - 300 | 45 | I |
| Th | 800 | mg/kg | 784 - 816 | 155 | R |
| U | 6.3 | mg/kg | 5.9 - 6.7 | 145 | R |
(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)
(?) Natural radionuclide activity concentrations derived from the elemental concentrations on basis of isotopic abundance and half-life data
The values listed above were established on the basis of a gravimetric dilution of materials with known uranium, thorium and potassium composition. The details concerning the criteria for qualification as a recommended or information value can be found in the respective report (attached).