بررسی نقش اکسید بیسموت و اکسید گادولینیوم به‌عنوان یک تقویت‌کننده بر توانایی محافظ گاما ترکیبات پلیمری مبتنی بر رزین غیراشباع با استفاده از ابزار شبیه‌سازی مونت‌کارلویی جینت4 ‏

نوع مقاله : مقاله پژوهشی

نویسندگان

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

چکیده

حضور سرب به‌عنوان اولین محافظ پرتوئی با یک سری ویژگی‌های خوب مانند چگالی زیاد و داشتن مقداری انعطاف‌پذیری و یک سری ویژگی‌های نامناسب مانند سمّی بودن، پایداری فیزیکی و شیمیایی پایین و وزن زیاد، مدت زیادی است دانشمندان را به فکر جایگزین برای آن انداخته است. در این پژوهش، ویژگی‌های محافظتی در برابر پرتو گاما ترکیبات پلیمری ‎با اکسید(گادولینیوم-تلوریم-بیسموت) (Gd2O3)x (TeO2)(30-x) – (resin)30 – (Bi2O3)40 (در اینجا x برابر است با 10، 15 و 20 درصد وزنی) و (Gd2O3)x-(TeO2)(40-x) (resin)20 – (Bi2O3)40 (در اینجا x برابر است با 20، 25 و 30 درصد وزنی) با استفاده از ابزار شبیه‌سازی مونت‌کارلویی جینت4 در محدوده 0/015 تا 15 مگا الکترون‌ولت بررسی می‌شود. در این بررسی، کمیت‌های مربوط به تضعیف فوتون مانند ضریب تضعیف خطی، ضریب تضعیف جرمی، لایه یک‌دهم مقدار، لایه نیم‌مقدار، عدداتمی مؤثر، چگالی الکترونی مؤثر، سطح مقطع اتمی کل، سطح مقطع الکترونی کل و مسیر آزاد میانگین و همچنین طیف ذرات ثانویه ایجاد شده به تفکیک نوع و انرژی آن‌ها برای سطوح مختلف انرژی گامای فرودی نشان داده می‌شود. برای اعتبارسنجی نتایج شبیه‌سازی، مقادیر ضریب تضعیف جرمی محاسبه شده از جینت4 با نتایج برنامه Phy-x مقایسه شده که نشان می‌دهد توافق خوبی با یکدیگر دارند. توافق بین داده‌ها، نشان می‌دهد که ابزار جینت4 یک روش خوب جهت بررسی ویژگی‌های حفاظ پرتوی گاما می‌باشد. نتایج به‌دست‌آمده نشان می‌دهد، توسعه رزین‌ها با افزودن اکسید فلزات واسطه مانند: گادولینیوم، تلوریم و بیسموت، در ترکیبات آن‌ها، سبب می‌شود خاصیت حفاظی آن در برابر پرتو گاما نیز افزایش یابد. 

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigating the Role of Bismuth Oxide and Gadolinium Oxide as an Enhancer of the Gamma Shielding Ability of Polymer Compounds Based on Unsaturated Resin Using the Monte Carlo Simulation Geant4 Tool

نویسندگان [English]

  • M. Rahmani Vareki
  • Mahdi Eshghi
  • M.R. Alipoor
Imam Hossein Comprehensive University, Tehran, Iran
چکیده [English]

The presence of lead as the first radiation shielding with a series of good features such as high density and having some flexibility and a series of inappropriate features such as toxicity, low physical and chemical stability, and high weight, has long made scientists think about alternatives. In this research, the protective properties against gamma radiation of polymer compounds with oxide (gadolinium-bismuth tellurium) (Gd2O3)x (TeO2)(30-x) - (resin)30 - (Bi2O3)40 (which here x is 10, 15, and 20% by weight percent) and (Gd2O3)x-(TeO2)(40-x) (resin)20 – (Bi2O3)40 (where x is 20, 25, and 30 by weight percent) was examined using the Monte Carlo simulation tool Gent4 in the range of 0.015 to 15  MeV. In this study, the quantities related to photon attenuation such as linear attenuation coefficient, mass attenuation coefficient, one-tenth-value layer, half-value layer, effective atomic number, effective electron density, the total atomic cross section, the total electron cross section, and the mean free path as well as the spectrum of secondary particles created according to their type and energy for different levels of incident gamma energy have been evaluated. The mass attenuation coefficient values ​​calculated from Geant4 were compared to the Phy-x results to validate the simulation results. The results showed a good agreement with each other. The agreement between the data revealed that the Geant4 tool was a good method to examin the properties of gamma ray shielding. The obtained results declared that the development of resins with the addition of oxides of transition metals such as gadolinium, tellurium, and bismuth increases the protective against gamma rays.

کلیدواژه‌ها [English]

  • Gamma ray
  • Shielding
  • Polymeric compounds
  • Bismuth oxide
  • Gadolinium oxide
  • Geant4

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مواد پیشرفته در مهندسی
دوره 43، شماره 4
آذر 1403
صفحه 85-108

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