Europium Oxide

Eu₂O₃

Absorbers

Density: 7.42 g/cm³

Europium oxide used as a burnable poison and control material. Eu-151 has a very large thermal neutron absorption cross section (~9,200 barns).

Composition

Nuclide / Element	Fraction
Eu-151	0.191240
Eu-153	0.208760
O-16	0.600000

Code output

MCNP

c Europium Oxide (Eu2O3)
c Density: 7.42 g/cm3 (use -7.42 on cell card)
c Eu2O3 = 2 Eu + 3 O = 5 atoms, natural Eu isotopics
m37   63151.80c  0.191240  $ Eu-151
      63153.80c  0.208760  $ Eu-153
       8016.80c  0.600000  $ O-16

Notes

Eu-151 (σ_a ≈ 9,200 b) is the primary absorbing isotope. Eu-152 (produced by capture on Eu-151) is radioactive and contributes to spent-fuel gamma source terms.

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