Abstract
Three methods are described for the production of large-area radiographic sources used in the investigation of documents. Tritium sources, which have a decay energy of 18 keV, are prepared by reacting titanium with tritium gas. Large sources of nickel-63, which has a decay energy of 67 keV, are fabricated by the resistance heating evaporation of 63NiO. Finally, carbon-14 sources with electron energies of 156 keV are prepared by the glow-discharge cracking of acetylene gas.
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