Table 1 Activity concentrations of radionuclides in diet samples and the annual effective doses from ingestion in high background natural radiation area and control area.
Sample Location | Sampling time (2018) | 210Pb (Bq/kg dw) | 210Po (Bq/kg dw) | 226Ra (Bq/kg dw) | 228Ra (Bq/kg dw) | 40K (Bq/kg dw) | 137Cs (Bq/kg dw) | 129I (μBq/kg dw) |
|---|---|---|---|---|---|---|---|---|
High background natural radiation area | 19–23 March | 1.2 ± 0.2 | 0.5 ± 0.1 | 1.03 ± 0.65 | 2.7 ± 1.9 | 78.3 ± 18.1 | 0.07 ± 0.01 | 2.6 ± 0.7 |
20–24 June | 0.9 ± 0.5 | 0.8 ± 0.3 | 0.66 ± 0.36 | 2.2 ± 1.4 | 56.6 ± 6.9 | 0.07 ± 0.01 | 3.4 ± 1.9 | |
20–24 August | 0.7 ± 0.4 | 0.7 ± 0.1 | 1.00 ± 0.42 | 2.9 ± 2.2 | 72.6 ± 14.6 | 0.06 ± 0.04 | 3.6 ± 1.8 | |
15–19 October | < 0.4 | 0.9 ± 0.2 | 0.40 ± 0.08 | 1.1 ± 0.4 | 23.2 ± 2.7 | < 0.03 | 1.7 ± 0.2 | |
Mean | 1.0 ± 0.3 | 0.7 ± 0.2 | 0.8 ± 0.5 | 2.2 ± 1.8 | 58 ± 25 | 0.06 ± 0.01 | 2.8 ± 1.6 | |
Dose (μSv/y) | 55.2 ± 28.7 | 80.1 ± 25.2 | 19.8 ± 12.9 | 139.9 ± 112.5 | 32.8 ± 14.0 | 0.08 ± 0.01 | (2.8 ± 1.6) × 10–5 | |
Cancer Risk (10–5) | 15.3 ± 3.7 | 20.6 ± 6.4 | 4.9 ± 3.2 | 39.6 ± 31.4 | 24.5 ± 10.5 | 0.029 ± 0.004 | (6.6 ± 3.7) × 10–6 | |
Control area | 17–19 March | 1.1 ± 0.4 | 0.6 ± 0.1 | 0.16 ± 0.08 | 0.17 ± 0.09 | 100.4 ± 17.7 | < 0.04 | 1.9 ± 0.5 |
9–11 June | < 0.6 | 0.6 ± 0.2 | 0.15 ± 0.11 | 0.14 ± 0.09 | 85.8 ± 3.4 | < 0.04 | 2.6 ± 1.2 | |
11–13 August | 0.8 ± 0.4 | 0.7 ± 0.3 | 0.22 ± 0.04 | < 0.2 | 100.8 ± 18.6 | < 0.04 | 1.8 ± 0.6 | |
12–14 October | < 0.7 | 0.6 ± 0.4 | < 0.1 | < 0.2 | 151.7 ± 38.3 | < 0.04 | 1.3 ± 0.2 | |
Mean | 1.0 ± 0.1 | 0.6 ± 0.3 | 0.19 ± 0.04 | 0.16 ± 0.02 | 110 ± 34 | < 0.04 | 1.9 ± 0.8 | |
Dose (μSv/y) | 90.8 ± 12.2 | 99.4 ± 42.5 | 7.5 ± 1.8 | 14.5 ± 1.4 | 94.5 ± 28.9 | – | (2.9 ± 1.3) × 10–5 | |
Cancer Risk (10–5) | 20.9 ± 2.8 | 24.9 ± 10.4 | 1.8 ± 0.4 | 4.1 ± 0.4 | 68.9 ± 21.4 | – | (6.7 ± 2.9) × 10–6 |
