Borated Polyethylene (5% B)

(CH₂)ₙ + 5% B

Shielding

Density: 0.95 g/cm³

Polyethylene loaded with 5 wt% natural boron. Combined neutron moderation (H) and thermal neutron capture (B-10) for effective neutron shielding.

Composition

Nuclide / Element	Fraction
B-10	0.009950
B-11	0.040050
Hydrogen	0.136542
Carbon	0.813458

S(α,β) required: poly

Code output

MCNP

c Borated Polyethylene (5 wt% natural B)
c Density: 0.95 g/cm3 (use -0.95 on cell card)
c Weight fractions
m30    5010.80c -0.009950  $ B-10
       5011.80c -0.040050  $ B-11
       1001.80c -0.136542  $ H
       6000.80c -0.813458  $ C
mt30  poly.20t

Notes

Natural boron is 19.9% B-10, 80.1% B-11. B-10 content can be increased by using enriched boron for enhanced thermal neutron capture.

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