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What is the parent of Xenon 133?

  1. May 28, 2014 #1
    I'm a nuclear medical student and am studying the radiopharmaceutical Xenon 133. I know that Xenon 133 decays into Cerium 133, but what is Xenon 133s direct parent? (I believe Xenon 133 is in the Uraninum 235 decay scheme.)

    Thank you in advance for your help.
  2. jcsd
  3. May 28, 2014 #2


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    The logical parent of 133Xe in an alpha decay chain would be 137Ba, having two more protons and two more neutrons. However 137Ba is stable.

    In fact 133Xe is a fission product of 235U, and is a waste produced by nuclear reactors. A large quantity was released in the Fukushima earthquake disaster.
  4. May 28, 2014 #3

    Vanadium 50

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    It's a fission product, as Bill said. It's also an I-133 daughter, and I-133 is also a fission product. Heavy element decay chains do not typically go as far as 133.
  5. May 30, 2014 #4
    I appreciate your responses. Thank you for your help.
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