Table 2.
Model inputs characterizing the radiation level, breathing pattern and the inhaled particles
| Quantity | Value | Source or explanation |
|---|---|---|
| Radiation exposure | ||
| Equilibrium radon concentration (Bq/m3) | 46 | UNSCEAR (2000) |
| Radioisotope concentration ratio (–) | 0.58/0.44/0.29 (218Po:214Pb:214Bi/214Po) | |
| Equilibrium factor (–) | 0.4 | BEIR VI, (1999) |
| Breathing parameters | ||
| Breathing mode | Nasal | ICRP 66, (1994) |
| Flow rate (L/min) | 18 | ICRP 66, (1994) |
| Breathing frequency (min−1) | 12 | ICRP 66, (1994) |
| Tidal volume (L) | 0.75 | ICRP 66, (1994) |
| Functional residual capacity (L) | 3.3 | ICRP 66, (1994) |
| Aerosol parameters | ||
| Particle number concentration in the inhaled air (m−3) | 7,820/51,270/25,090 (218Po:214Pb:214Bi/214Po) | Based on activity concentrations and decay half-lives |
| Particle diameter | See the size distribution in Fig. 3 | BEIR VI |