| Component | Fraction by weight | A | Z | (Z/A) |
Density [g/cm3] |
Radiation Length [cm] |
Radiation Length [g/cm2] |
|---|---|---|---|---|---|---|---|
| Al | 0.529251 | 26.9815 | 13. | 0.48181 | 2.699 | 8.8959 | 24.01 |
| O2 | 0.470749 | 15.9994 | 8. | 0.50019 | 0.0013298 | 25740. | 34.24 |
| Al2O3 | 21.8117 | 10.6463 | 0.48810 | 3.97(1, a, b) | 7.03769 | 27.9396 | |
| Al2O3 from PDG | 0.49038 | 3.970 | 7.04 | 27.94 |
| (1) | The industrial ruby used in the reference spheres at the ends of the ladders is 99.99% made of Al2O3. Its density is between 3.98 and 3.99 g/cm3 (c). Other quoted values of density for Al2O3 are: 3.970 g/cm3 (a) and 4.000 g/cm3 (b). |
Calculation performed using the method described here and imposing the density of the compound.
The corresponding definition of this material in
/* $Id: AliITSvPPRasymm.cxx,v 1.70 2003/08/14 20:24:51 nilsen Exp $ */is :
AliMaterial(78,"SDD ruby sph. Al2O3$",0.218101E+02,0.106467E+02,0.39700E+01,0.48539E+01,0.99900E+03);