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How come light photons penetrate these solutions easily

  1. Apr 11, 2005 #1

    I'm looking for an answer to the following question -

    X-rays are attenuated by liquid iodine solutions (in fact, these solutions are used as medical imaging contrast agents). so far so good.
    How come light photons penetrate these solutions easily ? (these solutions appear water like - transparent)

    Thanks for an educated explanation.

  2. jcsd
  3. Apr 11, 2005 #2

    Meir Achuz

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    The absorption of light by matter is frequency dependent.
    This is related to the molecular structure of the material, and so is different for different materials. The absorption is greatest near a resonant frequency of the particular molecule.
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