Abstract
The influence of the type of glass used in the discharge tubes on the calibration of a spectrometer that is used for the measurement of nitrogen-15 by emission spectrometry has been investigated. Discrepancies in the values obtained for the same experimental samples measured with a Statron, Model NOI-5, emission spectrometer and with a Model NOI-4 emission spectrometer were traced to the use, with the latter instrument, of sealed glass calibration standards supplied by the manufacturer and prepared with glass different from that supplied for the preparation of experimental samples.
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