These teeth were then tested to determine their level of Strontium-90, a radioactive fission product that escapes in nuclear power plant emissions.

这些乳牙都要经过测试，以确定它们的锶- 90的积存程度。锶- 90是一种核裂变的产品，它们会从核电站的排放物中逃逸和扩散。

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Xenon-133 is a radioactive noble gas produced during nuclear fission that poses no concern at the detected level.

FORBES: EPA Sounds an 'All-Clear' (so far) for Western U.S.