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PROBLEM TO BE SOLVED : To provide particles which are good in roundness and chemical durability in spite of containing a large amount of P, and to provide a production method thereof.
SOLUTION : Provided are particles for use in radiotherapy in a mammalian containing, as principal ingredients, A (wherein A is at least one element selected from among rare earth metallic elements and Al), P, and O, wherein the P content is 15-50 wt.% in terms of P2O5, and the longer side/shorter side ratio is 1.0-1.1 on the average.
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