Specific forms of isotopic research materials include thin films and foils for use as accelerator targets, metal or other compounds in the form of bars or wires, and metal sheets.Methods of fabrication include evaporation, sputtering, rolling, electrolytic deposition, pressing, sintering, and casting.High-purity metal forms of plutonium, americium, and curium are prepared by vacuum reduction/distillation.Both fissionable and nonfissionable neutron dosimeters are prepared for determining the neutron energy spectra, flux, and fluence at various locations within a reactor.