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- W2085153210 abstract "Abstract A method is described for determining small concentrations of oxygen in single crystals of gallium phosphide; 14-MeV3He particles were used to convert 16O into 18F, which was then separated from other radioactive nuclides produced by bombardment of gallium. Coincidence counting of γ-pairs produced by annihilation of emitted positrons was then used. Thin surface layers were removed from the crystals after irradiation to avoid interference from surface contamination and from recoiled oxygen nuclei driven into the lattice during bombardment. Results are reproducible and appear to be accurate to within 20%. Observed oxygen levels in gallium phosphide single crystals varied from about 5·1017 atoms cm−3 in specimens prepared by solution growth or halogen transport, to about 5·1018 atoms cm−3 in specimens prepared by wet hydrogen transport, 2·lO-19 atoms cm−3 in oxygen-doped solution-grown crystals." @default.
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- W2085153210 date "1971-05-01" @default.
- W2085153210 modified "2023-09-23" @default.
- W2085153210 title "Determination of oxygen in gallium phosphide and silicon by helium-3 activation" @default.
- W2085153210 cites W2034321970 @default.
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- W2085153210 doi "https://doi.org/10.1016/s0003-2670(01)82149-8" @default.
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