کامپوزیت‌های پلیمری تقویت‌شده با عناصر سنگین برای محافظت از پرتو گاما و نوترون: یک مطالعه شبیه‌سازی

نوع مقاله : مقاله پژوهشی

نویسندگان

• محمدرضا علی پور ¹
• مهدی عشقی ²

¹ گروه فیزیک، دانشگاه جامع امام حسین(ع)، تهران، ایران.

² گروه فیزیک، دانشگاه جامع امام حسین (ع)، تهران، ایران

10.22067/jmme.2025.89902.1161

چکیده

محافظ‌های کامپوزیت پلیمری بدون سرب در پرتو پرشکی برای محافظت از بیماران در برابر قرار گرفتن در معرض تشعشعات غیرضروری استفاده می‌شوند. از شبیه‌سازی مونت‌کارلو برای تخمین خواص محافظ پرتو گاما کامپوزیت‌های پلیمری تقویت‌شده با تنگستن، در محدوده انرژی فوتون 15 کیلو الکترون‌ولت تا 10 مگا الکترون‌ولت استفاده شد. ضریب تضعیف خطی و جرمی، لایه نیم مقدار، لایه یک‌دهم مقدار، عدد اتمی موثر و ضریب انباشت را محاسبه شد. برای اعتبارسنجی شبیه‌سازی، نتایج با داده‌های نظری حاصل از برنامه Phy-x، مقایسه شد. مشاهده شد که داده‌های برنامه Phy-X و ابزار شبیه‌سازی Geant4 مطابقت خوبی داشتند. برای ارزیابی تعدیل نوترون‌ها، سطح مقطع حذف نوترون‌های سریع و حرارتی کامپوزیت‌های پلیمری مورد بررسی قرار گرفت. با توجه به نتایج مشاهده شد که نمونه P-6 ، به‌دلیل افزودن تنگستن، افزایش قابل توجهی در تراکم نشان داد که منجر به بهبود حفاظت در برابر تشعشعات گاما شد. نتایج نشان داد که سطوح انرژی به‌طور قابل توجهی بر نفوذ پرتو گاما تأثیر می‌گذارد. نتایج نشان داد که همیشه افزایش تنگستن در نمونه‌ها منجر به افزایش مقادیر سطح مقطع حذف نوترون‌های سریع نخواهد شد. در نتیجه، باتوجه به این نتایج نمونه P-3 قابلیت محافظت بهتری نسبت به نمونه‌های دیگر در برابر پرتو گاما و نوترون نشان داد. این نتایج نشان می‌دهد که ترکیب و ریزساختار کامپوزیت پلیمری را می‌توان برای بهبود خواص تضعیف تشعشعات برای کاربردهای فیزیک پزشکی بهینه کرد.

کلیدواژه‌ها

• پرتو گاما
• نوترون
• حفاظ
• کامپوزیت‌های پلیمری
• Phy-x
• Geant4

موضوعات

• مواد پیشرفته

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عنوان مقاله [English]

Heavy Element-Enhanced Polymer Composites for Gamma and Neutron Radiation Shielding: A Simulation Study

نویسندگان [English]

• Mohamadreza Alipoor ¹
• Mahdi Eshghi ²

¹ Department t of Physics, Imam Hossein Comprehensive University, Tehran, Iran

² Department of Physics, Imam Hossein University, Tehran, Iran

چکیده [English]

Lead-free polymer composite shields are used in radiotherapy to protect patients from unnecessary radiation exposure. Monte Carlo simulation was used to estimate the gamma ray shielding properties of tungsten-doped polymer composites in the photon energy range of 15 keV to 10 MeV. The linear and mass attenuation coefficients, half-value layer, tenth-value layer, effective atomic number, and stacking coefficient were calculated. To validate the simulation, the results were compared with theoretical data obtained from the Phy-x program. It was observed that the Phy-X program data and the Geant4 simulation tool were in good agreement. To evaluate the neutron modulation, the fast and thermal neutron removal cross sections of the polymer composites were investigated. According to the results, it was observed that sample P-6 showed a significant increase in density due to the addition of tungsten, which led to improved protection against gamma radiation. The results showed that energy levels significantly affect gamma ray penetration. The results showed that increasing tungsten in the samples does not always lead to an increase in the fast neutron removal cross section values. Consequently, according to these results, sample P-3 showed better protection against gamma and neutron radiation than the other samples. These results indicate that the composition and microstructure of the polymer composite can be optimized to improve radiation attenuation properties for medical physics applications.

کلیدواژه‌ها [English]

• Gamma ray
• Neutron
• Shielding
• Polymer-Composites
• Phy-x
• Geant4

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