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Table A.1
Basic parameters used for the model calculation.
| Quantity | Symbol | Value | Unit |
|---|---|---|---|
| Average chondrule radius | 0.25 | mm | |
| Average matrix grain radius | 1 | μm | |
| Intrinsic mass density | ϱi | 3.58 | g cm−3 |
| Mass fraction Fe | XFe | 2.21 × 10−1 | |
| Mass fraction Al | XAl | 1.23 × 10−2 | |
| Mass fraction K | XK | 9.96 × 10−4 | |
| Heat conductivity (a) | Kb | 4.29 | W m−1 K−1 |
| Specific heat (a) | cp | 714 | J kg−1 K−1 |
| 26Al/27Al ratio | 5.25 × 10−5 | ||
| 60Fe/56Fe ratio | 1.15 × 10−8 | ||
| 40K/39K ratio | 1.58 × 10−3 | ||
| Heating rate 26Al | h | 1.65 × 10−7 | W kg−1 |
| Half live | τ1∕2 | 0.72 | Ma |
| Energy | E | 3.19 | MeV |
| Heating rate 60Fe | h | 9.10 × 10−11 | W kg−1 |
| Half live | τ1∕2 | 2.62 | Ma |
| Energy | E | 2.89 | MeV |
| Heating rate 40K | h | 3.11 × 10−11 | W kg−1 |
| Half live | τ1∕2 | 1248 | Ma |
| Energy | E | 0.693 | MeV |
Notes. (a) At 300 K. Kb is for the completely compacted material.
References.Data for 26Al from Kita et al. (2013), for 60Fe from Tang & Dauphas (2015), and for 40K from Lodders et al. (2009).
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