Table 1.
Comparison of radon and thoron exhalation rates obtained by the ventilated-type accumulation chamber, accumulation chamber with scintillation cell, and in situ monitor (MSZ) method.
| Intercomparison | Methods | Radon Exhalation Rate (mBq m−2 s−1) | Thoron Exhalation Rate (mBq m−2 s−1) |
|---|---|---|---|
| 1st measurement | Ventilated-type accumulation chamber | 3.6 ± 0.5 | 797 ± 336 |
| Accumulation chamber with scintillation cell | 4.6 ± 2.9 | – | |
| In situ monitor (MSZ) method | 1.1 ± 0.1 | 584 ± 103 | |
| 2nd measurement | Ventilated type accumulation chamber | 4.3 ± 0.5 | 1120 ± 321 |
| Accumulation chamber with scintillation cell | 8.8 ± 5.3 | – | |
| In situ monitor (MSZ) method | 5.1 ± 1.8 | 474 ± 177 |