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PROBLEM TO BE SOLVED : To provide a new boron compound suitable for boron neutron capture therapy.SOLUTION : The above problem is solved by obtaining a composition for boron neutron capture therapy, comprising a boron-containing rare earth compound as an active ingredient, by the steps of : mixing a boron compound solution with a rare earth compound solution; and obtaining a precipitate of the boron-containing rare earth compound from the mixed liquor obtained by the step.