利用熱原子效應濃縮鐵-59之研究

Study of the Enrichment of IORN-59 by Hot Atom Effect

莊瑞堂(J. T. Chuang) ； 魏如津(J. C. Wei) ； 楊末雄(M. H. Yang) ； 葉錫溶(S. J. Yeh)

《化學》 63年1期 (1974/03) Pp. 7-13

https://doi.org/10.6623/chem.1974002

摘要

本文以黃血鹽為照射靶，研究由(n, γ)反應生成之Fe-59的反跳效應(recoil effect)，並尋求有利於高比放射能(high specific activity)Fe-59之製造條件。利用陽離子交換法分離反跳鐵原子，並試就此分離方法之某些要素作系統性的檢討。由照射物質所接觸之氣體條件的改變，發現在空氣中之初期保留(initial retention)及熱囘火(thermal annealing)反應較在真空中為低，顯示有「氧氣效應」的存在。為高比放射能同位素製造的實用目的，進而探求照射條件及氣體環境改變時，對Fe-59濃縮效應的影響。結果發現在氧氣存在下，較短時間之照射，對高比放射能Fe-59的製造較為有利。

並列摘要

Potassium ferrocyanide was used as target material to study the recoil effect of Fe-59 atoms produced by the (n, γ) reaction . The opitimum conditions for the production of high specific activity Fe-59 were also examined. Some aspects on the method of cation exchange separation, which was employed as a separation means throughout this study, were systematically investigated. Studying by the variation of gaseous ambient of target material, it was found that the initial retention as well as thermal annealing reaction in the atmosphere of air was lower than those in vacuum, revealing the existence of ＂oxygen effect＂. In order to extend to the practical preparation of high specific of Fe-59, some influencing factors such as irradiation condition and gaseous atmosphere were also investigated. It was found that a relatively short irradiation of target material under the presence of oxygen atmosphere was proven to be more preferential for producing high specific activity of Fe-59.