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Table 1
Physical parameters of short-period (SP) and long-period (LP) radioactive isotopes considered in the model.
| τrad | Hrad | |||
| (years) | J kg-1 | |||
|
|
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| 26Al | 6.7 × 10-7 | 1.05 × 106 | 4.84 × 1012 | |
| 60Fe | 2.5 × 10−8/−7 | 2.16 × 106 | 5.04 × 1012 | |
| 53Mn | 2.8 × 10-8 | 5.34 × 106 | 4.55 × 1012 | |
|
|
||||
| 40K | 1.2 × 10-6 | 1.80 × 109 | 1.66 × 1012 | |
| 232Th | 6.0 × 10-8 | 2.02 × 1010 | 1.68 × 1013 | |
| 235U | 9.0 × 10-9 | 1.02 × 109 | 1.82 × 1013 | |
| 238U | 2.9 × 10-8 | 6.45 × 109 | 1.92 × 1013 | |
Notes. Xrad: initial mass fraction – note that there are two values for 60Fe, τrad: mean lifetime, Hrad: heat released per unit mass.
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