Abstract
225Ac was prepared by the 226Ra(γ, n) reaction on an electron accelerator (MT-25 microtron) at FLNR. The radiation yield of 225Ac was 550 Bq/(μA h mg 226Ra). 225Ac was isolated from the target material and radioactive impurities by the ion-exchange procedure. The 225Ac:227Ac:226Ra activity ratio in the preparation was 1:∼2 × 10−9:≤6 × 10−5.
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