Carbon Dioxide

CO₂

Moderators & Coolants

Density: 0.00184 g/cm³

Carbon dioxide gas at STP. Coolant in gas-cooled reactors (Magnox, AGR) and supercritical CO₂ Brayton cycle power conversion.

Composition

Nuclide / Element	Fraction
Carbon (natural)	0.333333
O-16	0.666667

Code output

MCNP

c Carbon Dioxide (CO2) at STP
c Density: 0.00184 g/cm3 (use -0.00184 on cell card)
m26    6000.80c  0.333333  $ C (natural)
       8016.80c  0.666667  $ O-16

Notes

Density at STP (~20°C, 1 atm). In AGRs, CO₂ operates at ~4 MPa and ~650°C. For supercritical CO₂ cycles, density is much higher (~200–500 kg/m³).

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