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>

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  1. A. S. Russell and R. Rossi, Proc. Roy. Soc. (London) 87, 478 (1912).
  2. L. Aronberg, Astrophys. J. 47, 96 (1918).
  3. J. L. Rose and R. K. Stranathan, Phys. Rev. 49, 916 (1936).
  4. See, for example, S. Tolansky, High Resolution Spectroscopy, (Methuen and Company, Ltd., London, England, 1947).
  5. P. Zeeman, Proc. Koninkl. Nederland Akad. Wetensch. Amsterdam 16, 155 (1913).
  6. J. C. McLennan and D. S. Ainslee, Trans. Roy. Soc. Can. 18, 137 (1924).
  7. I. B. Green, J. Opt. Soc. Am. and Rev. Sci. Instr. 11, 213 (1925).
  8. H. Schiüler and E. Würm, Naturwiss. 15, 971 (1927).
  9. D. S. Hughes and C. Eckart, Phys. Rev. 36, 694 (1930).
  10. D. S. Hughes, Phys. Rev. 38, 857 (1931).
  11. R. Baldock and J. R. Patton, Unclassified Document Y-758 (1951).
  12. Ornstein, Vreeswijk, and Wolfsohn, Physica 1, 53 (1934).
  13. Available from National Research Corporation, Cambridge 42, Massachusetts.
  14. Performed by J. W. Redmond and co-workers, Assay Laboratory, Y-12 Area, Oak Ridge, Tennessee.
  15. G. H. Dieke, "Progress Report on a Study of Standard Methods for Spectrographic Analysis," Report W-36 (Johns Hopkins University, 1943).

Ainslee, D. S.

J. C. McLennan and D. S. Ainslee, Trans. Roy. Soc. Can. 18, 137 (1924).

Aronberg, L.

L. Aronberg, Astrophys. J. 47, 96 (1918).

Baldock, R.

R. Baldock and J. R. Patton, Unclassified Document Y-758 (1951).

Dieke, G. H.

G. H. Dieke, "Progress Report on a Study of Standard Methods for Spectrographic Analysis," Report W-36 (Johns Hopkins University, 1943).

Eckart, C.

D. S. Hughes and C. Eckart, Phys. Rev. 36, 694 (1930).

Green, I. B.

I. B. Green, J. Opt. Soc. Am. and Rev. Sci. Instr. 11, 213 (1925).

Hughes, D. S.

D. S. Hughes and C. Eckart, Phys. Rev. 36, 694 (1930).

D. S. Hughes, Phys. Rev. 38, 857 (1931).

McLennan, J. C.

J. C. McLennan and D. S. Ainslee, Trans. Roy. Soc. Can. 18, 137 (1924).

Patton, J. R.

R. Baldock and J. R. Patton, Unclassified Document Y-758 (1951).

Redmond, J. W.

Performed by J. W. Redmond and co-workers, Assay Laboratory, Y-12 Area, Oak Ridge, Tennessee.

Rose, J. L.

J. L. Rose and R. K. Stranathan, Phys. Rev. 49, 916 (1936).

Rossi, R.

A. S. Russell and R. Rossi, Proc. Roy. Soc. (London) 87, 478 (1912).

Russell, A. S.

A. S. Russell and R. Rossi, Proc. Roy. Soc. (London) 87, 478 (1912).

Schiüler, H.

H. Schiüler and E. Würm, Naturwiss. 15, 971 (1927).

Stranathan, R. K.

J. L. Rose and R. K. Stranathan, Phys. Rev. 49, 916 (1936).

Tolansky, S.

See, for example, S. Tolansky, High Resolution Spectroscopy, (Methuen and Company, Ltd., London, England, 1947).

Würm, E.

H. Schiüler and E. Würm, Naturwiss. 15, 971 (1927).

Zeeman, P.

P. Zeeman, Proc. Koninkl. Nederland Akad. Wetensch. Amsterdam 16, 155 (1913).

Other

A. S. Russell and R. Rossi, Proc. Roy. Soc. (London) 87, 478 (1912).

L. Aronberg, Astrophys. J. 47, 96 (1918).

J. L. Rose and R. K. Stranathan, Phys. Rev. 49, 916 (1936).

See, for example, S. Tolansky, High Resolution Spectroscopy, (Methuen and Company, Ltd., London, England, 1947).

P. Zeeman, Proc. Koninkl. Nederland Akad. Wetensch. Amsterdam 16, 155 (1913).

J. C. McLennan and D. S. Ainslee, Trans. Roy. Soc. Can. 18, 137 (1924).

I. B. Green, J. Opt. Soc. Am. and Rev. Sci. Instr. 11, 213 (1925).

H. Schiüler and E. Würm, Naturwiss. 15, 971 (1927).

D. S. Hughes and C. Eckart, Phys. Rev. 36, 694 (1930).

D. S. Hughes, Phys. Rev. 38, 857 (1931).

R. Baldock and J. R. Patton, Unclassified Document Y-758 (1951).

Ornstein, Vreeswijk, and Wolfsohn, Physica 1, 53 (1934).

Available from National Research Corporation, Cambridge 42, Massachusetts.

Performed by J. W. Redmond and co-workers, Assay Laboratory, Y-12 Area, Oak Ridge, Tennessee.

G. H. Dieke, "Progress Report on a Study of Standard Methods for Spectrographic Analysis," Report W-36 (Johns Hopkins University, 1943).

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