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<p>Actinium-225 is a promising radiopharmaceutical isotope; however, its current production is insufficient to meet the rapidly growing demand. Therefore, we proposed a method for separating radium-228 (<sup>228</sup>Ra) and thorium-232 (<sup>232</sup>Th) from thorium dioxide dissolved by the thermochemical conversion method, using polyvinylpolypyrrolidone (PVPP) as the adsorbent. In a highly concentrated nitric acid environment, PVPP selectively adsorbs thorium ions, while radium ions remain in solution, thus enabling effective separation of <sup>228</sup>Ra from <sup>232</sup>Th. <sup>228</sup>Ra is then co-precipitated with sodium carbonate and magnesium chloride Hexahydrate, followed by heating the precipitate to obtain a <sup>228</sup>Ra target law material based on magnesium oxide.</p>

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Radium-228 target fabrication after separation from thorium-232 by polyvinylpolypyrrolidone for radiopharmaceutical actinium-225 production

  • 期刊论文

  • 发表日期：

    2025年11月18日

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  • Feng Yin,
  • Tomoo Yamamura,
  • Tatsuya Suzuki

摘要

Actinium-225 is a promising radiopharmaceutical isotope; however, its current production is insufficient to meet the rapidly growing demand. Therefore, we proposed a method for separating radium-228 (228Ra) and thorium-232 (232Th) from thorium dioxide dissolved by the thermochemical conversion method, using polyvinylpolypyrrolidone (PVPP) as the adsorbent. In a highly concentrated nitric acid environment, PVPP selectively adsorbs thorium ions, while radium ions remain in solution, thus enabling effective separation of 228Ra from 232Th. 228Ra is then co-precipitated with sodium carbonate and magnesium chloride Hexahydrate, followed by heating the precipitate to obtain a 228Ra target law material based on magnesium oxide.