تولید آمونیاک نشان‌دار شده با نیتروژن-13 در هدف مایع با بدنه‌ی نیوبیم با استفاده از سیکلوترون کرج

نوع مقاله: مقاله فنی

نویسندگان

1 گروه فیزیک، دانشکده علوم، دانشگاه زنجان، صندوق پستی: 3486-11365، زنجان ـ ایران

2 پژوهشکده‌ی کشاورزی هسته‌ای، پژوهشگاه علوم و فنون هسته‌ای، سازمان انرژی اتمی ایران، صندوق پستی: 498-31485، کرج ـ ایران

چکیده

یک روش مناسب و معمول برای تولید نیتروژن-13 استفاده از واکنش N13O(p,α)16 است. ماده‌ی هدف برای تولید نیتروژن-13 آب خالص است. آزمایش اول با بمباران پروتونی هدف آب خالص با بدنه‌ی نقره که سطح داخلی آن با طلا آب‌کاری شده بود انجام شد. اما به علت واکنش طلا با آمونیاک نشان‌دار شده با نیتروژن-13 که نقطه‌ی ضعف این لایه‌ی داخلی محسوب می‌شود، بدنه-ی هدف مایع از جنس نیوبیم طراحی و ساخته شد. مهم‌ترین ویژگی نیوبیم مقاومت بالای شیمیایی این فلز است. رادیونوکلید
نیتروژن-13 به وسیله‌ی باریکه‌ای از پروتون‌ها به انرژی 5/17 مگاالکترون ولت و با جریان 12 میکروآمپر و در مدت زمان 20 دقیقه تولید شد. بهره‌ی تولید در حدود 5/84 میلی‌کوری بر میکروآمپر ساعت به دست آمد.
 

کلیدواژه‌ها


عنوان مقاله [English]

Production of nitrogen-13 labeled ammonia in liquid niobium target at the Karaj cyclotron

نویسندگان [English]

  • Shahrzad Fazli 1
  • Mohammad Mirzaei 2
  • Tayeb Kakavand 1
  • Ali Satari 2
  • Mohmmad Rahimi 2
  • Zohreh Abdi 1
چکیده [English]

A common and routine method for producing nitrogen-13 is 16O (p, α) 13N reaction, where nitrogen-13 is produced with the bombardment of O-16 through the induced proton, and is accompanied by emission of α-particles. Target material for N-13 production is pure water. The first experiment is carried out with a gold target. Because of the gold reaction with nitrogen-13, labeled ammonia (Au++n 13NH3=Au(13NH3)+n), a new liquid target made of niobium, was designed to overcom this drawback. One of the advantages of niobium element is its high chemical resistivity. The 13N radioisotope was produced at the Agricultural, Medical and Industrial Research School (AMIRS), where the target was irradiated with proton particles of 17.5 MeV energy and the current of 12 μA for 20 min. The yield of the radioisotope was about 84.5 mCi/μA h.
 

کلیدواژه‌ها [English]

  • Labeled ammonia
  • Nitrogen-13
  • Liquid target
  • Cyclotron

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