| Total radioactivity | K (ppm) | U (ppm) | Th (ppm) | Radon concentration (kBq m−3) (±9%) |
1 | 1600 | 6.6 | 58 | 40 | 87.41 |
2 | 1300 | 6.2 | 43.4 | 36.5 | 75.44 |
3 | 5560 | 6.9 | 210 | 49 | B.D.L.* |
4 | 1700 | 7.1 | 59 | 41 | B.D.L.* |
5 | 2810 | 8.2 | 92.5 | 43.9 | B.D.L*. |
6 | 1200 | 6.7 | 36.3 | 41.4 | 54.63 |