Ordinary Concrete (Portland)

Shielding

Density: 2.3 g/cm³

Standard Portland cement concrete. Primary biological shielding material in reactor facilities. Composition from PNNL-15870.

Composition

Nuclide / ElementFraction
Hydrogen0.010000
Carbon0.001000
Oxygen0.529110
Sodium0.016000
Magnesium0.002000
Aluminum0.033890
Silicon0.337000
Potassium0.013000
Calcium0.044000
Iron0.014000

S(α,β) required: lwtr

Code output

MCNP
c Ordinary Concrete (Portland), PNNL-15870
c Density: 2.30 g/cm3 (use -2.30 on cell card)
c Weight fractions
m28    1001.80c -0.01000  $ H
       6000.80c -0.00100  $ C
       8016.80c -0.52911  $ O
      11023.80c -0.01600  $ Na
      12000.80c -0.00200  $ Mg
      13027.80c -0.03389  $ Al
      14000.80c -0.33700  $ Si
      19000.80c -0.01300  $ K
      20000.80c -0.04400  $ Ca
      26000.80c -0.01400  $ Fe
mt28  lwtr.20t

Notes

Composition from PNNL-15870 Compendium. Hydrogen content is critical for neutron shielding effectiveness. Composition varies by mix design.

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