Historical Radiation Injury

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  • Twenty-one days post exposure, the volunteer's hair fell out in a two inch circle around x-ray beam.


  • The hair behind the coin remained due to shielding from silver coin.


  • The published result of this experiment suggested using x-rays as a substitute for shaving.


  • In 1896 the long and short term effects of radiation were still not known.


  • Exposure for temporary hair loss is approximately 300 rem or 6x annual exposure limit to skin.


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