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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 53, Iss. 12 — Dec. 1, 1963
  • pp: 1410–1415

Total Quantum Flux of Isotropic Sources

J. WOODLAND HASTINGS and GREGORIO WEBER  »View Author Affiliations

JOSA, Vol. 53, Issue 12, pp. 1410-1415 (1963)

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The total radiant flux from a solution containing a radioactive compound, hexadecane-l-C14, plus an appropriate scintillator has been determined. The procedure used involves comparison of its luminescent emission with the light scattered by glycogen illuminated with a monochromatic homogeneous light beam of known photon flux. From the result obtained the scintillation quantum yield of a β- disintegration from carbon 14 has been determined to be 793 photons; thus 5.25% of the energy appears as light.

J. WOODLAND HASTINGS and GREGORIO WEBER, "Total Quantum Flux of Isotropic Sources," J. Opt. Soc. Am. 53, 1410-1415 (1963)

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  1. A homogeneous source is one in which the flux per unit volume of source is constant over any small portion of it.
  2. An isotropic source is one in which the flux is independent of the direction considered.
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  14. Although this intensity was near the sensitivity limit of our instrument, the exact value was verified by measurements of more concentrated standards prior to qualitative dilution.
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