Hydrologic Resources Management Program and Underground Test Area Project FY 2000 Progress Report Page: 89 of 156
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Tritium concentration in the target materials
Virtually all of the 3H produced in each target capsule is implanted in the target material,
or in the walls of the capsule. Assuming a uniform neutron flux, it is anticipated that the
3H will be evenly distributed on all surfaces.
The surface area of the interior of each capsule is approximately equal to the combined
surface areas of a right circular cylinder + a rectangular solid. There are slight variations
between each capsule. In addition, the total surface area is somewhat greater in capsules
containing Si because the silicon targets were -3x the length of the SiO2 targets.
The surface area of the cylindrical capsules is approximately:
27trL + (2)7tr2 = 27c(0.45 cm)(7 cm) + (2)7E(0.45 cm)2 = 21.06 cm2
and that of the target materials is:
Si target: 2(3.0 cm)(0.9 cm) + 2(3.0 cm)(0.1 cm) + 2(0.9 cm)(0.1 cm) = 6.18 cm2
SiO2 target: 2(1.0 cm)(0.9 cm) + 2(1.0 cm)(0.1 cm) + 2(0.9 cm)(0.1 cm) = 2.18 cm2.
The total surface area inside the capsules is:
Si target capsules: ~27.24 cm2
SiO2 target capsules: ~23.24 cm .
Assuming the implanted tritium is uniformly distributed, the approximate concentration
per unit area in the reference standards is:
Si target: (4.13 x 10"4 3H atoms)/(27.24 cm2) = 1.52 x 103 atoms/cm2
SiO2 target: (4.13 x 1014 3H atoms)/(23.24 cm2) = 1.78 x 10"3 atoms/cm277
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Davisson, M. L.; Eaton, G. F.; Hakemi, N. L.; Hudson, G. B.; Hutcheon, I. D.; Lau, C. A. et al. Hydrologic Resources Management Program and Underground Test Area Project FY 2000 Progress Report, report, July 1, 2001; California. (https://digital.library.unt.edu/ark:/67531/metadc1411019/m1/89/: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.