Baryte Concrete

Shielding

Density: 3.35 g/cm³

Atom density: 0.065468 atoms/b·cm

High-density concrete with baryte (BaSO₄) aggregate, for gamma shielding where thickness is limited.

Where these numbers come from

PNNL-15870 Rev. 2, "Concrete, Barite (Type BA)" (id concrete-barite-type-ba): density and full isotopic composition are taken from the compendium unchanged.

Open the compendium entry for the isotope-by-isotope table and the compendium's own notes.

Material compositions from PNNL-15870 Rev. 2 (April 2021), R.S. Detwiler, R.J. McConn Jr., T.F. Grimes, S.A. Upton, and E.J. Engel, Compendium of Material Composition Data for Radiation Transport Modeling, Pacific Northwest National Laboratory. Full report (DOI 10.2172/1782721)

Composition

Nuclide (ZAID)	Weight fraction	Atom fraction	Atom density (atoms/b·cm)
H-1 (1001)	3.5841e-3	1.0959e-1	7.1744e-3
H-2 (1002)	8.2380e-7	1.2604e-5	8.2515e-7
O-16 (8016)	3.1078e-1	5.9874e-1	3.9198e-2
O-17 (8017)	1.2582e-4	2.2807e-4	1.4931e-5
O-18 (8018)	7.1867e-4	1.2304e-3	8.0552e-5
Mg-24 (12024)	9.3149e-4	1.1967e-3	7.8349e-5
Mg-25 (12025)	1.2285e-4	1.5151e-4	9.9188e-6
Mg-26 (12026)	1.4065e-4	1.6681e-4	1.0921e-5
Al-27 (13027)	4.1830e-3	4.7774e-3	3.1276e-4
Si-28 (14028)	9.6067e-3	1.0581e-2	6.9274e-4
Si-29 (14029)	5.0546e-4	5.3754e-4	3.5192e-5
Si-30 (14030)	3.4508e-4	3.5477e-4	2.3226e-5
S-32 (16032)	1.0215e-1	9.8454e-2	6.4456e-3
S-33 (16033)	8.3174e-4	7.7735e-4	5.0891e-5
S-34 (16034)	4.8556e-3	4.4050e-3	2.8838e-4
S-36 (16036)	1.2097e-5	1.0365e-5	6.7855e-7
Ca-40 (20040)	4.8518e-2	3.7413e-2	2.4493e-3
Ca-42 (20042)	3.3999e-4	2.4970e-4	1.6347e-5
Ca-43 (20043)	7.2633e-5	5.2101e-5	3.4109e-6
Ca-44 (20044)	1.1484e-3	8.0506e-4	5.2705e-5
Ca-46 (20046)	2.3021e-6	1.5437e-6	1.0106e-7
Ca-48 (20048)	1.1231e-4	7.2170e-5	4.7248e-6
Fe-54 (26054)	2.6819e-3	1.5322e-3	1.0031e-4
Fe-56 (26056)	4.3658e-2	2.4052e-2	1.5746e-3
Fe-57 (26057)	1.0263e-3	5.5546e-4	3.6365e-5
Fe-58 (26058)	1.3897e-4	7.3922e-5	4.8395e-6
Ba-130 (56130)	4.6466e-4	1.1022e-4	7.2161e-6
Ba-132 (56132)	4.4956e-4	1.0502e-4	6.8757e-6
Ba-134 (56134)	1.0921e-2	2.5133e-3	1.6454e-4
Ba-135 (56135)	3.0009e-2	6.8547e-3	4.4876e-4
Ba-136 (56136)	3.6019e-2	8.1669e-3	5.3467e-4
Ba-137 (56137)	5.1889e-2	1.1680e-2	7.6463e-4
Ba-138 (56138)	3.3365e-1	7.4555e-2	4.8809e-3

This is the material as formulated. The cards below carry weight fractions, written negative, which is what MCNP and Serpent read as a mass basis.

Bound scattering

ENDF/B-VII.1 has a thermal scattering law for this material as formulated, so the cards attach lwtr.20t. Free-gas scattering would misplace the thermal spectrum here.

What ENDF/B-VII.1 forced

O18 folded into O16: ENDF/B-VII.1 has no O18 evaluation (7.1867e-4 by weight, so the spectrum does not care).

The cards keep the material's mass and atom count; a nuclide the library cannot name hands its share to one it can. That is why a card row can differ slightly from the table above.

Generated material cards

MCNP

c Baryte Concrete
c PNNL-15870 Rev. 2, "Concrete, Barite (Type BA)" -
c reactormc.net/nrdp/material/baryte-concrete; rho = 3.35 g/cm3 (use -3.35 on
c the cell card)
c O18 folded into O16: ENDF/B-VII.1 has no O18 evaluation (7.1867e-4 by weight,
c so the spectrum does not care).
m29    1001.80c  -0.003584  $ H1
       1002.80c  -8.2380e-7  $ H2
       8016.80c  -0.311497  $ O16
       8017.80c  -1.2582e-4  $ O17
       12024.80c  -9.3149e-4  $ Mg24
       12025.80c  -1.2285e-4  $ Mg25
       12026.80c  -1.4065e-4  $ Mg26
       13027.80c  -0.004183  $ Al27
       14028.80c  -0.009607  $ Si28
       14029.80c  -5.0546e-4  $ Si29
       14030.80c  -3.4508e-4  $ Si30
       16032.80c  -0.102150  $ S32
       16033.80c  -8.3174e-4  $ S33
       16034.80c  -0.004856  $ S34
       16036.80c  -1.2097e-5  $ S36
       20040.80c  -0.048518  $ Ca40
       20042.80c  -3.3999e-4  $ Ca42
       20043.80c  -7.2633e-5  $ Ca43
       20044.80c  -0.001148  $ Ca44
       20046.80c  -2.3021e-6  $ Ca46
       20048.80c  -1.1231e-4  $ Ca48
       26054.80c  -0.002682  $ Fe54
       26056.80c  -0.043658  $ Fe56
       26057.80c  -0.001026  $ Fe57
       26058.80c  -1.3897e-4  $ Fe58
       56130.80c  -4.6466e-4  $ Ba130
       56132.80c  -4.4956e-4  $ Ba132
       56134.80c  -0.010921  $ Ba134
       56135.80c  -0.030009  $ Ba135
       56136.80c  -0.036019  $ Ba136
       56137.80c  -0.051889  $ Ba137
       56138.80c  -0.333648  $ Ba138
mt29   lwtr.20t

MCNP and Serpent cards use .80c (ENDF/B-VII.1 at 293.6 K) — renumber m1 and change the suffix to match your deck. SCONE compositions are atom densities in atoms/barn-cm with the .03 suffix matching temp 300. See the library reference before changing a suffix: the mapping is not portable between vendors.

Notes

Denser and higher-Z than ordinary concrete, so better per centimetre against gammas — but it carries a third of the hydrogen, so it is worse against neutrons. ENDF/B-VII.1 has no bound-scattering evaluation for hydrogen in concrete; the card attaches lwtr.20t, which is the usual stand-in because the hydrogen is bound in cement hydrates. It is an approximation, not a table for concrete.

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