title: Improvements in determinations using the Cu-64 annihilation gamma rays.
abstract: The method of gammagamma coincidence counting has been applied to the determination of Cu via the (64)Cu annihilation gamma rays. Preliminary experiments show that at least an order of magnitude reduction in (24)Na interference may be obtained by employing the 511-511 keV coincidence peak rather than the singles 511-keV peak. The effect of the sample matrix on the yield of (24)Na pair-production events was investigated by a combination of experimental measurements and Monte Carlo calculations.
authors.affiliation: National Institute of Standards and Technology, Analytical Chemistry Division, 100 Bureau Drive MS 8395, Gaithersburg, MD 20899-8395, USA. bryan.tomlin@nist.gov
authors.forename: Bryan E
authors.initials: BE
authors.lastname: Tomlin
authors.forename: Rolf
authors.initials: R
authors.lastname: Zeisler