Heavy Water

D₂O

Moderators & Coolants

Density: 1.105 g/cm³

Deuterium oxide at room temperature. Moderator and coolant in CANDU and other heavy-water reactors, providing superior neutron economy.

Composition

Nuclide / Element	Fraction
H-2 (D)	0.666667
O-16	0.333333

S(α,β) required: hwtr

Code output

MCNP

c Heavy Water (D2O)
c Density: 1.105 g/cm3 (use -1.105 on cell card)
m17    1002.80c  0.666667  $ H-2 (deuterium)
       8016.80c  0.333333  $ O-16
mt17  hwtr.20t

Notes

Density at 20°C. Real heavy water typically has 99.75–99.80 at% D; trace H-1 can be added if modeling isotopic purity.

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