McAlister Daniel R, Horwitz E Philip
PG Research Foundation, 1955 University Lane, Lisle, IL 60532, USA; Eichrom Technologies, LLC, 1955 University Lane, Lisle, IL 60532, USA.
PG Research Foundation, 1955 University Lane, Lisle, IL 60532, USA; Eichrom Technologies, LLC, 1955 University Lane, Lisle, IL 60532, USA.
Appl Radiat Isot. 2018 Oct;140:18-23. doi: 10.1016/j.apradiso.2018.06.008. Epub 2018 Jun 21.
This work presents a complete scheme for the selective separation of actinium and radium isotopes from bulk Th target material, in a process that may be applied in a separation scheme for the production of Ac by proton spallation on thorium. Thorium metal is dissolved in sulfuric acid with small amounts of HF. Actinium and radium are retained on cation exchange resin from the sulfate medium, while neutral and anionic thorium sulfate complexes are rejected. Following rinsing steps to remove residual thorium, actinium and radium are recovered from the cation exchange resin using 5 M HNO. Further separations of actinium via extraction chromatography with UTEVA and DGA resins yield actinium in >92% yield, while providing additional decontamination from thorium and other spallation byproducts. The radium fraction can be further processed following ingrowth of Ac from Ra to produce additional Ac free from any potential Ac impurity.
这项工作提出了一种从大量钍靶材料中选择性分离锕和镭同位素的完整方案，该过程可应用于通过钍上的质子散裂生产锕的分离方案。金属钍溶解在含有少量氢氟酸的硫酸中。锕和镭从硫酸盐介质中保留在阳离子交换树脂上，而中性和阴离子硫酸钍络合物则被排斥。经过冲洗步骤以去除残留的钍后，使用5M硝酸从阳离子交换树脂中回收锕和镭。通过使用UTEVA和DGA树脂的萃取色谱法进一步分离锕，产率>92%，同时提供了对钍和其他散裂副产物的额外去污。镭馏分可以在镭生长出锕后进一步处理，以生产不含任何潜在锕杂质的额外锕。
