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Determination of oxygen in silicon and carbide by activation with 27.2 meV alpha particlesThe Si sample was polished on one side, and on the other side Ni was applied chemically and soldered with Pb to a water cooled Cu substrate. Optical quartz standard was fixed from the other side. Si carbide samples were soldered to a substrated with In. The prepared samples were irradiated in a cyclotron with a 27.2 MeV alpha particle beam. The layers were removed from the Si and Si carbide samples by grinding and the positron activity of F-18(t sub 1/2 110 min) was measured by using a gamma, gamma coincidence spectrometer with two NaI(TI) crystals. For analysis of Si carbide, the activity decay curve of the samples was recorded to find the contribution of the positron activity of Cu-65(t sub 1/2 12.9 hr) which formed from Ni impurity on irradiation.
Document ID
19780014242
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Dolgolenko, A. P.
(NASA Headquarters Washington, DC United States)
Kornienko, N. D.
(NASA Headquarters Washington, DC United States)
Lithovchenko, P. G.
(NASA Headquarters Washington, DC United States)
Date Acquired
September 3, 2013
Publication Date
March 1, 1978
Subject Category
Inorganic And Physical Chemistry
Report/Patent Number
NASA-TM-75266
Report Number: NASA-TM-75266
Accession Number
78N22185
Funding Number(s)
CONTRACT_GRANT: NASW-2790
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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