Table 1.
Natural radioactivity the concentration range and average values
| Natural radionuclides (Bq/kg) | |||
|---|---|---|---|
| 226 Ra | 232 Th | 40 K | |
| Concentration range | 17-60 | 11-64 | 140-850 |
| Average values | 35 | 45 | 400 |
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