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I X-ray emission from a klystron tube

  1. Aug 27, 2016 #1
    So, I was thinking about building a low power klystron (around 5W.) I know this involves making an electron gun and electron guns can emit x-rays. I have a few questions:
    1. Will 5W produce x-rays?
    2. If so, what is a safe dosage of x-rays?
    3. How can I shield myself and others from the x-rays produced?

    The x-rays are an unwanted side effect.
     
  2. jcsd
  3. Aug 27, 2016 #2
    The operating voltages of a klystron are too low to cause X-rays.
    To build any sort of electron tube is extremely difficult, and a klystron would be impossible for you to make. Even good commercial ones are touchy to get going.
     
  4. Aug 27, 2016 #3

    ZapperZ

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    This is not true. Klystrons are RF sources for accelerating structures in particle accelerators. If you look at any of them at such a facility, they are heavily shielded.

    That, I can definitely agree on.

    Zz.
     
  5. Aug 27, 2016 #4
    Of course, klystrons come in all sizes. But for instance, the very old 723A/B reflex klystron, which gives a watt or two of RF, uses ordinary receiver type power supplies, less than 1 kV and no X-Ray precautions were ever required.
     
  6. Aug 27, 2016 #5

    ZapperZ

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    I didn't say they aren't. But your statement made it sounds like klystrons physically are too low-powered to produce harmful radiation. This is false.

    Zz.
     
  7. Aug 27, 2016 #6
    Actually the voltages are rather lower than my memory was telling me - data sheet at this URL.
    http://www.r-type.org/exhib/aaa0592.htm
     
  8. Aug 27, 2016 #7
    Thank you for telling me about high power klystrons. I do remember now that they are used for TV transmitters. But I do remember that they were not originally able to provide the high power required for airborne radar.
     
  9. Aug 27, 2016 #8

    mfb

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    If you have to ask those questions, you clearly do not have the required knowledge to build such it safely. We won't help you to harm yourself here.
     
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