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Related Experiment Videos

The radiation phosphene.

K D Steidley1

  • 1Department of Radiation Oncology, Saint Barnabas Medical Center, Livingston, NJ 07039.

Vision Research
|January 1, 1990
PubMed
Summary
This summary is machine-generated.

Cerenkov radiation, not fluorescence, is the primary cause of phosphenes induced by radium exposure. This finding reclassifies "radium phosphene" as a "radiation phosphene" for better accuracy.

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Area of Science:

  • Ophthalmology
  • Medical Physics
  • Radiation Biology

Background:

  • Phosphenes are visual sensations perceived without light.
  • Previous understanding attributed phosphene generation to fluorescence.
  • Radium exposure in humans historically produced phosphenes.

Purpose of the Study:

  • To elucidate the dominant mechanism behind radium-induced phosphenes.
  • To differentiate between fluorescence and Cerenkov radiation as causes.
  • To propose a unified terminology for radiation-induced visual sensations.

Main Methods:

  • Experimental data from 1905 human radium exposure studies.
  • Theoretical calculations of photon yield from Cerenkov radiation in the eye.
  • Comparison of experimental phosphene intensity with calculated Cerenkov radiation yields.

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Main Results:

  • Low-flux X-rays below the Cerenkov threshold cause phosphenes via direct retinal action.
  • X-rays above the threshold produce faint ocular luminescence.
  • Experimental radium phosphene intensity aligns with Cerenkov radiation calculations, not fluorescence.
  • Beta-rays contribute ~80% and gamma-rays ~20% to radium phosphenes experimentally.
  • Calculated Cerenkov radiation suggests ~90% beta-ray and ~10% gamma-ray contribution.

Conclusions:

  • Cerenkov radiation is the dominant mechanism for radium phosphenes.
  • The term "radium phosphene" is a misnomer.
  • A unified term "radiation phosphene" should encompass X-ray and particle-induced visual sensations.