B₄C (natural boron)

B₄C

Absorbers

Density: 2.52 g/cm³

Boron carbide with natural boron (19.9% B-10). Control rod and burnable absorber material. B-10 has a large thermal neutron absorption cross section (3840 barns).

Composition

Nuclide / Element	Fraction
B-10	0.159200
B-11	0.640800
Carbon (natural)	0.200000

Code output

MCNP

c B4C (natural boron: 19.9% B-10)
c Density: 2.52 g/cm3 (use -2.52 on cell card)
c B4C = 4 B + 1 C = 5 atoms total
m32    5010.80c  0.159200  $ B-10
       5011.80c  0.640800  $ B-11
       6000.80c  0.200000  $ C (natural)

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