Determination of sodium in high purity silica by activation analysis.
High purity fused silica samples and NBS standards were irradiated in the Sandia Reactor Facility for 2 hr at a thermal flux of 10(10) neutrons/cm(2)/sec. (24)Na was produced by the reaction (23)Na(n, gamma)(24)Na (14.9 hr half-life, alpha = 0.5 barn), and decayed with emission of 1.37 and 2.75 MeV gamma-rays. With the stated flux and irradiation time, sodium at the 3 ppm level has been determined with a standard deviation of 0.2 ppm. Values obtained by thermal neutron-activation analysis agree well with results obtained by emission spectrography and flame spectrophotometric methods.
Kenna
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Sandia Laboratory Analytical Methods Division 1121 Albuquerque, New Mexico 87115, U.S.A.
Conrad
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