Chen Li , Ya-Ling Zhang , Zheng Wei , Yong Sun , Lei Yang , Yu-Cui Gao , Wei Wang , Yan-Shi Zhang
{"title":"p、α和重离子辐照钍和铀靶材产生225Ac和223Ra的截面预测","authors":"Chen Li , Ya-Ling Zhang , Zheng Wei , Yong Sun , Lei Yang , Yu-Cui Gao , Wei Wang , Yan-Shi Zhang","doi":"10.1016/j.apradiso.2025.111981","DOIUrl":null,"url":null,"abstract":"<div><div>—This work studies effective methods for producing <sup>225</sup>Ac and <sup>223</sup>Ra by bombarding <sup>232</sup>Th and natural uranium targets with different incident particles. Direct production of <sup>225</sup>Ac via high-energy proton bombardment of <sup>232</sup>Th inevitably contains <sup>227</sup>Ac impurities, complicating the separation and purification processes. In contrast, obtaining <sup>225</sup>Ac through the generated <sup>225</sup>Ra can avoid <sup>227</sup>Ac contamination. Given the low cross section for the proton-thorium reaction to produce <sup>225</sup>Ra, exploring new methods to improve <sup>225</sup>Ra production efficiency is critical. This study utilized several physical models of the Monte Carlo transport codes FLUKA and PHITS to calculate the production cross sections of <sup>225</sup>Ac, <sup>225</sup>Ra, <sup>223</sup>Ra, and <sup>227</sup>Th via the bombardment of thorium and uranium targets with energetic protons, α-particles, <sup>9</sup>Be, and <sup>12</sup>C across an energy range of 10–800 MeV/u. The predicted cross sections were then compared with existing experimental data. The predictions indicate that the energy thresholds to produce <sup>225</sup>Ac, <sup>225</sup>Ra, and <sup>223</sup>Ra via α-particle and heavy ion irradiation are lower than those for proton, and the production cross sections are significantly increased, the incident energy corresponding to the peak cross section is mainly below 100 MeV/u. According to the PHITS JQMD-2.0 results, using α-particle bombardment of thorium targets to produce <sup>225</sup>Ra and subsequently obtaining high-purity <sup>225</sup>Ac may be an efficient production pathway. Moreover, when the α-particle energy is below 100 MeV/u, the predicted cross section of <sup>225</sup>Ra for the natural uranium target is higher than that for the thorium target, suggesting that α-particle bombardment of the natural uranium target could be a potential new method to improve <sup>225</sup>Ac production efficiency. This study provides theoretical reference for subsequent experimental cross section measurement and isotope production.</div></div>","PeriodicalId":8096,"journal":{"name":"Applied Radiation and Isotopes","volume":"225 ","pages":"Article 111981"},"PeriodicalIF":1.8000,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Predictions of 225Ac and 223Ra production cross sections from p, α and heavy ion irradiated thorium and uranium targets\",\"authors\":\"Chen Li , Ya-Ling Zhang , Zheng Wei , Yong Sun , Lei Yang , Yu-Cui Gao , Wei Wang , Yan-Shi Zhang\",\"doi\":\"10.1016/j.apradiso.2025.111981\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>—This work studies effective methods for producing <sup>225</sup>Ac and <sup>223</sup>Ra by bombarding <sup>232</sup>Th and natural uranium targets with different incident particles. Direct production of <sup>225</sup>Ac via high-energy proton bombardment of <sup>232</sup>Th inevitably contains <sup>227</sup>Ac impurities, complicating the separation and purification processes. In contrast, obtaining <sup>225</sup>Ac through the generated <sup>225</sup>Ra can avoid <sup>227</sup>Ac contamination. Given the low cross section for the proton-thorium reaction to produce <sup>225</sup>Ra, exploring new methods to improve <sup>225</sup>Ra production efficiency is critical. This study utilized several physical models of the Monte Carlo transport codes FLUKA and PHITS to calculate the production cross sections of <sup>225</sup>Ac, <sup>225</sup>Ra, <sup>223</sup>Ra, and <sup>227</sup>Th via the bombardment of thorium and uranium targets with energetic protons, α-particles, <sup>9</sup>Be, and <sup>12</sup>C across an energy range of 10–800 MeV/u. The predicted cross sections were then compared with existing experimental data. The predictions indicate that the energy thresholds to produce <sup>225</sup>Ac, <sup>225</sup>Ra, and <sup>223</sup>Ra via α-particle and heavy ion irradiation are lower than those for proton, and the production cross sections are significantly increased, the incident energy corresponding to the peak cross section is mainly below 100 MeV/u. According to the PHITS JQMD-2.0 results, using α-particle bombardment of thorium targets to produce <sup>225</sup>Ra and subsequently obtaining high-purity <sup>225</sup>Ac may be an efficient production pathway. Moreover, when the α-particle energy is below 100 MeV/u, the predicted cross section of <sup>225</sup>Ra for the natural uranium target is higher than that for the thorium target, suggesting that α-particle bombardment of the natural uranium target could be a potential new method to improve <sup>225</sup>Ac production efficiency. This study provides theoretical reference for subsequent experimental cross section measurement and isotope production.</div></div>\",\"PeriodicalId\":8096,\"journal\":{\"name\":\"Applied Radiation and Isotopes\",\"volume\":\"225 \",\"pages\":\"Article 111981\"},\"PeriodicalIF\":1.8000,\"publicationDate\":\"2025-06-06\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Applied Radiation and Isotopes\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0969804325003264\",\"RegionNum\":3,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"CHEMISTRY, INORGANIC & NUCLEAR\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Applied Radiation and Isotopes","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0969804325003264","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"CHEMISTRY, INORGANIC & NUCLEAR","Score":null,"Total":0}
Predictions of 225Ac and 223Ra production cross sections from p, α and heavy ion irradiated thorium and uranium targets
—This work studies effective methods for producing 225Ac and 223Ra by bombarding 232Th and natural uranium targets with different incident particles. Direct production of 225Ac via high-energy proton bombardment of 232Th inevitably contains 227Ac impurities, complicating the separation and purification processes. In contrast, obtaining 225Ac through the generated 225Ra can avoid 227Ac contamination. Given the low cross section for the proton-thorium reaction to produce 225Ra, exploring new methods to improve 225Ra production efficiency is critical. This study utilized several physical models of the Monte Carlo transport codes FLUKA and PHITS to calculate the production cross sections of 225Ac, 225Ra, 223Ra, and 227Th via the bombardment of thorium and uranium targets with energetic protons, α-particles, 9Be, and 12C across an energy range of 10–800 MeV/u. The predicted cross sections were then compared with existing experimental data. The predictions indicate that the energy thresholds to produce 225Ac, 225Ra, and 223Ra via α-particle and heavy ion irradiation are lower than those for proton, and the production cross sections are significantly increased, the incident energy corresponding to the peak cross section is mainly below 100 MeV/u. According to the PHITS JQMD-2.0 results, using α-particle bombardment of thorium targets to produce 225Ra and subsequently obtaining high-purity 225Ac may be an efficient production pathway. Moreover, when the α-particle energy is below 100 MeV/u, the predicted cross section of 225Ra for the natural uranium target is higher than that for the thorium target, suggesting that α-particle bombardment of the natural uranium target could be a potential new method to improve 225Ac production efficiency. This study provides theoretical reference for subsequent experimental cross section measurement and isotope production.
期刊介绍:
Applied Radiation and Isotopes provides a high quality medium for the publication of substantial, original and scientific and technological papers on the development and peaceful application of nuclear, radiation and radionuclide techniques in chemistry, physics, biochemistry, biology, medicine, security, engineering and in the earth, planetary and environmental sciences, all including dosimetry. Nuclear techniques are defined in the broadest sense and both experimental and theoretical papers are welcome. They include the development and use of α- and β-particles, X-rays and γ-rays, neutrons and other nuclear particles and radiations from all sources, including radionuclides, synchrotron sources, cyclotrons and reactors and from the natural environment.
The journal aims to publish papers with significance to an international audience, containing substantial novelty and scientific impact. The Editors reserve the rights to reject, with or without external review, papers that do not meet these criteria.
Papers dealing with radiation processing, i.e., where radiation is used to bring about a biological, chemical or physical change in a material, should be directed to our sister journal Radiation Physics and Chemistry.