FIELD: nuclear medicine. SUBSTANCE: target containing naturally occurring thorium isotope 229Th is irradiated by proton beam in cyclotron. Desired isotope thorium- 229 accumulates in target during threshold nuclear reaction of 230Th (p, pn). Target material is, in particular, 230Th or 230ThF4, or yet metallic thorum-230. EFFECT: retention of high specific activity and radioisotope purity of 230ThO2. 2 cl, 1 dwg
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