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Table 2
Activity levels of 40K, 214Pb, 214Bi and 228Ac measured by the drone. Ambient equivalent dose rate measured: (1) from the 226Ra activity levels. (2) from gross gamma counts (cps) conversion factor. H*(10) values recorded by RS200 ionisation chamber.
| Soil activity levels | Ambient equivalent dose rate H*(10) | ||||||
|---|---|---|---|---|---|---|---|
| 40K | 214Bi | 214Pb | 228Ac | H*(10)1 | H*(10)2 | RS200 | |
| (Bq/kg) | (Bq/kg) | (Bq/kg) | (Bq/kg) | (µSv/h) | (µSv/h) | ±0.001 (µSv/h) | |
| Control | 480±90 | 20±5 | 21 ±6 | 33 ±9 | 0.05 ±0.03 | 0.078 ±0.006 | 0.077 |
| 1 | < MDA | 960 ±180 | 720 ±140 | < MDA | 0.51 ±0.14 | 0.59±0.02 | 0.591 |
| 2 | < MDA | 790 ±150 | 740 ±140 | < MDA | 0.47 ±0.13 | 0.52±0.02 | 0.475 |
| 3 | < MDA | 410±80 | 490 ±100 | < MDA | 0.29 ±0.08 | 0.48±0.02 | 0.476 |
| 4 | < MDA | 370±70 | 450±90 | < MDA | 0.27 ±0.08 | 0.49±0.02 | 0.476 |
| 5 | < MDA | 730 ±140 | 670±130 | < MDA | 0.44 ±0.11 | 0.53±0.02 | 0.522 |
| 6 | < MDA | 540 ±100 | 640 ±120 | < MDA | 0.37 ±0.10 | 0.49±0.02 | 0.485 |
| 7 | < MDA | 480 ±90 | 410±80 | < MDA | 0.29 ±0.08 | 0.37±0.02 | 0.366 |
| 8 | < MDA | 630 ±120 | 700 ±130 | < MDA | 0.42 ±0.11 | 0.47±0.02 | 0.382 |
| 9 | < MDA | 580±110 | 570±110 | < MDA | 0.37 ±0.10 | 0.47±0.02 | 0.433 |
| 10 | < MDA | 130±30 | 90 ±20 | < MDA | 0.10 ±0.03 | 0.21 ±0.01 | 0.253 |
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