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  • 1 Food and Drug Administration 200C Street SW 20204 Washington, DC (USA)
  • | 2 University of Maryland 20742 College Park MD (USA)
  • | 3 National Institute of Standards and Tecnology Inorganic Analytical Research Division 20899 Gaithersburg Maryland USA
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Background enhancements in neutron capture prompt -ray activation analysis were determined over a large range of total scattering cross sections by irradiating graphite, S, Be, paraffin, urea and H2O targets. Relative to irradiations using no target, B, Na, Cl, Al, and Pb backgrounds were 7–12 times greater with 2 ml of H2O, but N and Fe backgrounds were only 1.2 and 1.75 times greater, respectively. For biological targets, background count rates can be determined as functions of the 2223 ke V H photopeak count rate.