Rhodium-105 (0.567 MeV β^-, 319 keV γ, 35.4 h half-life) was produced by neutron irradiation of enriched ¹⁰⁴Ru (>99%) over multiple decades. A method is reported to recover the previously irradiated ¹⁰⁴Ru (trapped in HCl as RuO₄²⁻) as the metal. The ¹⁰⁴Ru was recovered in >93% yield and >98% enrichment. Neutron re-irradiation of the recycled ¹⁰⁴Ru produced ¹⁰⁵Rh, which was successfully radiolabeled with tetrathioethers in high yield. This recovery and recycling method for enriched ¹⁰⁴Ru makes ¹⁰⁵Rh production and utilization economical.

中文翻译：

---

富集 104Ru 金属靶材的回收、再循环和再辐照以实现 105Rh 的成本效益生产

Rhodium-105 (0.567 MeV β ^- , 319 keV γ, 35.4 h 半衰期) 是通过中子辐照富集的¹⁰⁴ Ru (>99%) 几十年产生的。据报道，有一种方法可以回收先前辐照过的¹⁰⁴ Ru（在 HCl 中作为 RuO ₄ ^2-捕获）作为金属。在¹⁰⁴的Ru回收在> 93％产率和> 98％的富集。中子再辐照回收的¹⁰⁴ Ru 产生了¹⁰⁵ Rh，它被四硫醚以高产率成功地放射性标记。这种对富集¹⁰⁴ Ru的回收再利用方法使¹⁰⁵ Rh的生产和利用具有经济性。