Table 1.
Radioactivity concentrations (Bqkg−1) of 226Ra, 232Th, 40K, 210Pb, and 137Cs in coastal marine sands and sediments.
| Sample Code | Weight (kg) | Activity Concentrations (Bqkg−1) | ||||
|---|---|---|---|---|---|---|
| 226Ra | 232Th | 40K | 210Pb | 137Cs | ||
| Beach Sand | ||||||
| S01 | 1421 | 21.5 ± 1.4 | 28.0 ± 2.8 | 78.7 ± 4.8 | ** | 0.11 |
| S02 | 1371 | 24.8 ± 1.2 | 54.9 ± 3.1 | 74.4 ± 3.2 | 42.7 ± 19.4 | 0.05 |
| S05 | 1592 | 14.3 ± 1.0 | 29.3 ± 2.2 | 29.5 ± 2.0 | (125.5 ± 12.2) | 0.04 |
| S06 | 1568 | 14.3 ± 1.0 | 10.4 ± 1.1 | 30.6 ± 2.1 | 24.7 ± 11.4 | 0.07 |
| S09 | 1501 | 13.6 ± 0.9 | 43.3 ± 3.3 | 56.9 ± 3.7 | 67.4 ± 13.5 | 0.19 |
| S10 | 1414 | 9.3 ± 0.7 | 30.0 ± 2.6 | 29.0 ± 2.1 | ** | 0.13 |
| S13 | 1038 | 15.6 ± 1.0 | 13.2 ± 1.3 | 32.0 ± 2.1 | ** | 0.07 |
| S14 | 1376 | 17.0 ± 1.1 | 13.6 ± 1.3 | 34.0 ± 2.3 | ** | 0.15 |
| Average | 16.30 | 27.84 | 45.64 | 44.9 | 0.10 | |
| Marine sediments | ||||||
| S03 | 1363 | 21.0 ±1.0 | 50.4 ± 3.0 | 93.9 ± 3.8 | 44.9 ± 1.9 | 0.05 |
| S04 | 1425 | 19.4 ± 1.4 | 47.3 ± 3.8 | 93.4 ± 5.7 | ** | 0.07 |
| S07 | 1532 | 12.8 ± 0.8 | 31.6 ± 1.2 | 39.6 ± 2.3 | (158.9 ± 12.9) | 0.07 |
| S08 | 1750 | 11.5 ± 0.8 | 31.0 ± 2.4 | 33.5 ± 2.6 | 42.9 ± 12.5 | 0.09 |
| S11 | 1496 | 13.8 ± 0.8 | 22.4 ± 2.2 | 30.8 ± 2.8 | 53.0 ± 11.4 | 0.13 |
| S12 | 1421 | 13.2 ± 1.0 | 28.0 ± 1.8 | 42.9 ± 2.0 | ** | 0.08 |
| S15 | 1332 | 17.7 ± 1.4 | 32.6 ± 2.6 | 42.2 ± 3.9 | 65.1 ± 14.2 | 0.09 |
| S16 | 1423 | 20.4 ± 1.2 | 32.5 ± 1.6 | 61.3 ± 2.7 | 28.1 ± 13.3 | 0.08 |
| Average | 16.2 | 34.5 | 54.7 | 46.8 | 0.08 | |
The results in the brackets ( ) are outliers and are excluded from the average; ** indicate that the activity is less than the minimum detectable activity (MDA).