مجله علوم، مهندسی و فناوری هسته‌ای

انباشت و مشخصه‏‌یابی لایه جاذب ید-125 بر هسته فرومغناطیس مورد استفاده در سیستم ترموبراکی‏‌تراپی

نوع مقاله : مقاله پژوهشی

نویسندگان

الهام محقق پور 1
شهاب شیبانی 1
لیلا فرزین 1
رضا صابر 2

1 پژوهشکده کاربرد پرتوها، پژوهشگاه علوم و فنون هسته‌ای، سازمان انرژی اتمی ایران، صندوق پستی: 8486-11365، تهران- ایران

2 مرکز تحقیقات علوم و تکنولوژی در پزشکی، دانشگاه علوم پزشکی تهران، صندوق پستی: ، تهران- ایران

https://doi.org/10.24200/nst.2024.1584.2025
چکیده
آلیاژ فرومغناطیس نیکل- مس با درصد وزنی (29/6-70/4%)، پوشش داده شده با لایه جاذب ید-125 به عنوان هسته مورد استفاده در سیستم ترموبراکی‏‌تراپی ساخته شد. لایه جاذب با ضخامت حدود 100μm، متشکل از کربن فعال با ساختار گرافیت میکروکریستالی، حاوی نقره و پلی‌‏استایرن با نسبت وزنی 70 به 30 می‌‏باشد. کربن فعال به دلیل ساختار متخلخل، یکی از جاذب‌‏های ترجیحی ید است. جذب ید-125 به واسطه جذب شیمیایی آن بر نقره دوپ شده در ساختار کربن فعال افزایش می‌‏یابد. پلی‌‏استایرن علاوه بر آنکه به عنوان چسب در ساختار لایه جاذب عمل می‌‏کند، جذب فیزیکی ید را بر روی سطح هسته پوشش داده شده تسهیل می‌‏کند. نتایج به‌دست‌آمده نشان داد که راندمان جذب ید-125، به صورت محلول یدید سدیم و با اکتیویته میانگین 5mCi بر روی هسته نیکل- مس/ پلی‌‏استایرن/ کربن فعال دوپ شده با نقره پس از 2 ساعت غوطه‌‏وری 20/31­% بود. در حالی که، پوشش طلا و نقره بر هسته فرومغناطیس نیکل- مس قبل از انباشت لایه جاذب، راندمان جذب ید-125 را به ترتیب تا 32/77% و 60/23% پس از 2 ساعت غوطه‌‏وری افزایش داد. یافته‏‌ها تأثیر قابل توجه پوشش طلا یا نقره بر افزایش راندمان استخراج را نشان می‌‏دهند. در تحقیق حاضر به منظور افزایش راندمان جذب ید-125 از روش استخراج مرحله به مرحله استفاده شده است.

کلیدواژه‌ها

استخراج مرحله به مرحله
هسته فرومغناطیس نیکل- مس
ترموبراکی‏‌تراپی

عنوان مقاله English

Coating and characterization of Iodine-125 absorbent layer on the ferromagnetic core used in the Thermo-Brachytherapy system

نویسندگان English

E. Mohagheghpour 1
Sh. Sheibani 1
L. Farzin 1
R. Saber 2
1 Radiation Application Research School, Nuclear Science and Technology Research Institute, AEOI, P.O.Box: 11365-8486, Tehran – Iran
2 Science and Technology Research Center in Medicine, Tehran University of Medical Sciences, P.O.Box: , Tehran - Iran
چکیده English

A Ni-Cu (70.4-29.6 wt%) ferromagnetic alloy coated with an absorber layer of iodine-125 was used as the core in the Thermo-Brachytherapy (TB) system. The absorber layer, which was 100 μm thick and had a microcrystalline graphite structure, consisted of silver-doped activated carbon and polystyrene in a 70:30 weight ratio. Activated carbon is a preferred adsorbent for iodine capture due to its porous nature. Silver doping in the carbon enhances the trapping of iodine-125 through chemical adsorption. Polystyrene, acting as a binder in the absorptive layer's structure, facilitates the physical absorption of iodine on the surface of the silver-doped activated carbon-coated core. Results showed that the extraction efficiency of iodine-125 (as sodium iodide solution) with an average activity of 5 mCi on the nickel-copper core/polystyrene/silver-doped activated carbon was 20.31% after 2 hours. Coating the nickel-copper ferromagnetic core with gold or silver before depositing the silver-doped activated carbon increased the extraction efficiency to 32.77% and 60.23% after 2 hours, respectively. These findings highlight the significant impact of silver or gold coating on enhancing extraction efficiency. Moreover, a multi-step extraction process was employed in this research, where extraction steps were repeated to increase the recovery of iodine-125.

کلیدواژه‌ها English

Multistage extraction
Ni-Cu ferromagnetic core
Thermo-brachytherapy
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