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The use of radioisotopes as a basis for radiophysical instrumental methods of analysis can be exemplified by the following: Iron-55 emits a K-capture electron from the nucleus whose radiation can be absorbed by a sulfur atom regardless of its chemical combination. A practical procedure is described for the measurement of sulfur in all forms (SO2, SO3, S2O3, RSH, R2S, RSSR, etc.) by using an uncalibrated source of iron-55, a sample holder, a suitable absorption cell, and an appropriate detecting instrument. The method for analytical determination of sulfur in hydrocarbons is very fast compared to the standard lamp or bomb used in present ASTM methods. The equipment has been built and operated. A method has been prepared for proposal.
National Aeronautics and Space Administration, Washington, D. C.
U. S. Atomic Energy Commission, Berkeley, Calif.