Molybdenum-99 and some other fission products such as promethium-147 are formed by the fission of 235 U. Applying an efficient separation approach, the 147 Pm can be isolated. The production of 147 Pm as a by-product of previously optimized conditions for fission molybdenum-99 process is precisely evaluated. Considering the numerous radionuclides with various half-lives accompanying the 147 Pm as impurities, a precise time window can be determined to perform an efficient separation process. The fission products activity calculations, using MCNPX and ORIGEN2.1 computer codes, were performed to achieve such a proper time window. Here, it is shown that 300 days after the end of bombardment (EOB), the radioactivity of the other radionuclides is reduced to 1% of 147 Pm radioactivity. The chemical process needed to separate the remaining radionuclides is then explained in detail.

中文翻译：

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在德黑兰研究反应堆中作为裂变钼99工艺副产品生产pro 147的评估

235 U的裂变形成了Mo-99和其他一些裂变产物，例如147 pro。应用有效的分离方法，可以分离出147 Pm。精确评估了先前优化裂变钼99工艺条件的副产品147 Pm的产量。考虑到伴随着147 Pm的大量具有不同半衰期的放射性核素作为杂质，可以确定一个精确的时间窗口以执行有效的分离过程。使用MCNPX和ORIGEN2.1计算机代码进行了裂变产物活动计算，以实现这样的适当时间窗口。此处显示，轰击（EOB）结束300天后，其他放射性核素的放射性降低到147 Pm放射性的1％。