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A because its Iodine, and Iodine is U-236.
It is Iridium or Ir-31 is the closest answer I could find for you. The actual Iridium used is Ir-192.
Another problem was that Uranium/U is not the one used its Radium so that can not be it.
And Europium is used for helping with curing brain tumors but only in trace amounts
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