Table 5.
Calculation of dose coefficient for inhalation of minerals of neodymium production (N-processes) containing 232Th, 238U and 235U series. Occupational coefficients are taken from ICRP 119(26). The weights indicated by a are calculated by scaling the activity of 238U to 235U (
). Here w denotes the weights, As the specific activity and f (=0.007204) refers to the relative abundance of 235U.
| Nuclid-specific dose coefficient | Value ( Sv Bq−1) |
Weight | Weighted value ( Sv Bq−1) |
|---|---|---|---|
232Th (slow, 5  ) |
12 | 1 | 12 |
228Ra (medium, 5  ) |
1.7 | 1 | 1.7 |
228Th (slow, 5  ) |
25 | 1 | 25 |
224Ra (medium, 5  ) |
2.4 | 1 | 2.4 |
238U (medium, 5  ) |
1.6 | 0.25 | 0.4 |
234U (medium, 5  ) |
2.1 | 0.25 | 0.525 |
230Th (slow, 5  ) |
7.2 | 0.25 | 1.8 |
226Ra (medium, 5  ) |
2.2 | 0.25 | 0.55 |
210Pb (fast, 5  ) |
1.1 | 0.25 | 0.275 |
210Po (medium, 5  ) |
2.2 | 0.25 | 0.55 |
235U (medium, 5  ) |
1.8 | 0.0116a | 0.02 |
231Pa (medium, 5  ) |
89 | 0.0116a | 1.03 |
227Ac (fast, 5  ) |
630 | 0.0116a | 7.31 |
| Total (per Bq 232Th) | 53.56 |