Beryllium

Moderators & Coolants

Density: 1.85 g/cm³

Beryllium metal used as a neutron reflector and moderator in research and test reactors. Excellent neutron economy due to (n,2n) reactions.

Composition

Nuclide / Element	Fraction
Be-9	1.000000

S(α,β) required: be-met

MCNP

c Beryllium Metal
c Density: 1.85 g/cm3 (use -1.85 on cell card)
m19    4009.80c  1.000000  $ Be-9
mt19  be-met.20t

Be is toxic; handling requires special safety precautions. The (n,2n) reaction on Be-9 makes it an effective neutron multiplier.