Table 2.
Radioactivity of 90Sr (mBq/g Ca) in deciduous teeth.
| 90Sr | ||
|---|---|---|
| Fukushima prefecture | Iwaki city-1 (6) | 1.45 ± 0.16 |
| Iwaki city-2 (8) | 1.28 ± 0.15 | |
| Iwaki city-3 (16) | 2.05 ± 0.67 | |
| Fukushima city-1 (14) | 1.61 ± 0.12 | |
| Fukushima city-2 (16) | LTD | |
| Koriyama city-1 (13) | 1.57 ± 0.12 | |
| Koriyama city-2 (16) | 1.77 ± 0.70 | |
| Reference prefecture | Hokkaido-1 (9) | 1.63 ± 0.13 |
| Hokkaido-2 (14) | LTD | |
| Niigata-1 (6) | 2.01 ± 0.09 | |
| Niigata-2 (14) | LTD | |
| Shizuoka-1 (6) | 1.95 ± 0.11 | |
| Shizuoka-2 (17) | LTD | |
| Kumamoto-1 (6) | 1.45 ± 0.08 | |
| Kumamoto-2 (16) | 1.88 ± 0.73 |
Data are shown as mean ± counting error. Parentheses show numbers of teeth in a sample. When the counts did not exceed the mean + 3SD of the background, we considered the value as LTD (lower than detection limit). SD, standard deviation.