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A Novel Technique for Raman Analysis of Highly Radioactive Samples Using Any Standard Micro-Raman Spectrometer
Published on: April 12, 2017
Determination of Trace Elements in Ruby Laser Crystals by Neutron Activation Analysis
Barbara A Thompson1, Eric C Miller1
1Institute for Materials Research, National Bureau of Standards, Washington, D.C. 20234.
Abstract:
Methods are described by which concentration levels have been determined for up to ten different trace elements and upper limits established for over 40 additional elements at the parts per million level or below in ruby crystals using neutron activation analysis. This information is required to determine the effect of trace element levels on laser performance. With conventional analytical methods difficulties arise because of both the refractory and insulating properties of the material. Because the crystals cannot be readily dissolved, the activation analysis was carried out nondestructively, irradiating the samples with highly thermalized neutrons to minimize formation of 24Na and 27Mg from (n, α) and (n, p) reactions on the Al2O3 matrix, and using a 47-cm3 Ge(Li) detector.
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