A–6
Table A–1. Neutron Thermalization and Absorption Data
Element
Weight Fractions
of Earth’s Crust
Collisions to
Thermalization
Thermal
Absorption
Cross Section
Hydrogen 0.0014 19.0 0.33
Boron * 109.2 759.00
Carbon * 120.6 0.0034
Nitrogen * 139.5 1.90
Oxygen 0.466 158.5 0.002
Sodium 0.028 224.9 0.53
Magnesium 0.021 237.4 0.063
Aluminum 0.081 262.8 0.23
Silicon 0.277 273.3 0.16
Phosphorus 0.001 300.8 0.19
Sulfur * 311.1 0.51
Chlorine * 343.3 33.00
Potassium 0.026 378.0 2.10
Calcium 0.036 387.3 0.43
Titanium 0.004 461.6 6.10
Manganese 0.001 528.5 13.30
Iron 0.050 537.2 2.53
Cadmium * 1074.6 2390.00
Lead * 1975.5 0.17
Uranium * 2268.6 4.20
* Weight fraction is less than 0.1%.
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