نوع مقاله : مقاله پژوهشی
نویسندگان
پژوهشکده چرخه سوخت هسته‌ای، پژوهشگاه علوم و فنون هسته‌ای، سازمان انرژی اتمی ایران، صندوق پستی: 8486-11365، تهران- ایران
چکیده
محصول فرایند خالص‌سازی مولیبدن-99 حاصل از انحلال اسیدی محصولات حاصل از شکافت اورانیوم-235، اغلب از درجه خلوص 95%-90% برخوردار است که ناخالصی‌های اکتیو و غیراکتیو موجود در آن سبب تخریب و کاهش راندمان در ژنراتورهای 99Mo/99mTc می‌شوند. استفاده از روش تصعید غیرمستقیم به عنوان یک مرحله اضافه برای افزایش خلوص و کاهش اتلاف مولیبدن به جای تصعید مستقیم می‌تواند تا حدی مؤثر باشد. در این روش مولیبدن محصول با عبور از ستون حاوی آلومینا جذب آن شده و پس از خشک شدن جاذب، تصعید خواهد شد. در پژوهش حاضر، عوامل مؤثر در جذب مولیبدن بر روی بستر آلومینا شامل مقدار جاذب، حجم و سرعت جریان محلول ورودی و غلظت مولیبدن آن، بهینه‌سازی شده و در نهایت راندمان جذب به 99-97% رسیده است. این مقادیر برای تولید 20mg مولیبدن-99 در مقیاس صنعتی در نظر گرفته شده است.
کلیدواژه‌ها
عنوان مقاله [English]
Optimization of molybdenum adsorption on alumina substrate for its final purification from Uranium-235 fission by indirect sublimation method
نویسندگان [English]
- M. Dayeni
- S. Shirvani Arani
- A. Bahrami Samani
- I. Dehghan
Nuclear Fuel Cycle Research School, Nuclear Science and Technology Research Institute, AEOI, P.O.Box: 11365-8486, Tehran - Iran
چکیده [English]
The product of the Molybdenum-99 purification process, obtained from Uranium-235 fission products, has a degree of purity of 90%-95%, which its present active and inactive impurities are destructive reducing the efficiency of 99mTc/99Mo generators. As an alternative to the common sublimation method, indirect sublimation could increase purity and reduce molybdenum loss. In this method, the molybdenum in the product will be absorbed by passing through the alumina column and then the dried absorbent will be sublimated. In the present study, the effective factors in molybdenum absorption such as the amount of adsorbent, and the volume and flow rate of the input solution and molybdenum were optimized. The final absorption efficiency reached 97-99%. This investigation is expected to be applied to molybdenum-99 production.
کلیدواژه‌ها [English]
- Mo-99
- Solid phase extraction
- Sublimation
- Tc-99m
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