What is the parent of Xenon 133?

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Xenon-133 (133Xe) is a fission product of Uranium-235 (235U) and decays into Cerium-133 (133Ce). The logical parent of 133Xe in an alpha decay chain is Barium-137 (137Ba), which is stable and has two more protons and neutrons than 133Xe. 133Xe is significant in nuclear medicine and was notably released during the Fukushima disaster, highlighting its relevance in discussions about nuclear waste management.

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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.
 
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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 http://www.nuc.berkeley.edu/node/5844 in the Fukushima earthquake disaster.
 
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.
 
I appreciate your responses. Thank you for your help.
 

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