Lead-Bismuth Eutectic

Pb-Bi

Moderators & Coolants

Density: 10.17 g/cm³

Lead-bismuth eutectic (44.5% Pb, 55.5% Bi by weight). Low melting point (~125°C) liquid metal coolant for fast reactors and spallation targets.

Composition

Nuclide / Element	Fraction
Lead	0.445000
Bi-209	0.555000

Code output

MCNP

c Lead-Bismuth Eutectic (LBE)
c Density: 10.17 g/cm3 (use -10.17 on cell card)
c Weight fractions
m25   82000.80c -0.4450  $ Pb (natural)
      83209.80c -0.5550  $ Bi-209

Notes

Eutectic melting point ~125°C. Activation product Po-210 (from Bi-209 neutron capture) is a radiological concern.

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