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Less harmful electromagnetic waves

  1. Jun 21, 2011 #1
    Hi guys,
    I am too old to remember basic knowledge about electromagnetic waves :D
    I am looking for a combination of an electromagnetic wave and a material such that the wave can pass through human tissues, but it is blocked by the material. All I know is that X-ray/gamma can penetrate human body but is absorbed by metals/lead. Are there any such other combination which are less harmful than X-ray. I have gone through Wikipedia for few hours but still have not found the answer yet.
    Could you please help me.
    Thank a lots.
     
  2. jcsd
  3. Jun 21, 2011 #2

    phyzguy

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    Science Advisor

    Radio waves pass easily through the human body, but are blocked by an appropriate thickness of metal (or any conductor).
     
  4. Jun 21, 2011 #3
    Thank you for the answer!
    But I think radio waves are able to diffract around the object, is that right?
     
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