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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 42, Iss. 6 — Jun. 1, 1952
  • pp: 383–386

Spectro-Isotopic Assay of Lithium

G. L. STUKENBROEKER, D. D. SMITH, G. K. WERNER, and J. R. MCNALLY,JR.  »View Author Affiliations


JOSA, Vol. 42, Issue 6, pp. 383-386 (1952)
http://dx.doi.org/10.1364/JOSA.42.000383


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Abstract

<p>The isotope spectrum shift in the 6707.8A resonance line of lithium has been used for the assay of the isotopes Li 6 and Li 7. A hollow cathode source loaded with 4 mg of Li<sub>2</sub>SO<sub>4</sub>is excited at 35 ma using purified helium at about 2- to 3-mm pressure as support gas. Characteristics, such as tube geometry, pressure, sample life, flow rate of gas, current, and anode-cathode spacing have been studied to give reproducible line intensity ratios. Precision of the method based on a 95 percent confidence interval is about 6 percent of the Li 6 content or, by difference, about 0.5 percent of the Li 7 content in natural material.</p><p>Spectra are obtained with a 21-foot, 30,000 lines per inch grating spectrograph using first order for which the Li 6-Li 7 isotope shift of 0.159A is readily separated. A multiplier phototube (1P28) set on the 4603A lithium line is used in an integrating circuit as an exposure meter.</p>

Citation
G. L. STUKENBROEKER, D. D. SMITH, G. K. WERNER, and J. R. MCNALLY,JR., "Spectro-Isotopic Assay of Lithium," J. Opt. Soc. Am. 42, 383-386 (1952)
http://www.opticsinfobase.org/josa/abstract.cfm?URI=josa-42-6-383


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References

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