کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5561196 1562114 2017 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Baseline evaluation for natural radioactivity level and radiological hazardous parameters associated with processing of high grade monazite
ترجمه فارسی عنوان
ارزیابی پایه برای سطح رادیو اکتیو طبیعی و پارامترهای خطرناکی مرتبط با پردازش مونازیت با درجه بالا
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست بهداشت، سم شناسی و جهش زایی
چکیده انگلیسی


- Activity concentration of radionuclides in monazite and its H. cake was >1000 Bq/kg.
- Radioactivity is mainly contributed to 228Ra, 226Ra, 223Ra and 210Pb.
- Risk parameters due to gonadal (AGDE) and cancer (ELCR) are above the safe limits.
- Radiological hazards indices (Irγ, Iα, Hex, Hin, DR and E) are too high.
- Radiation protection rules should be considered to prevent the health risks.

Egyptian monazite is a promising resource and investment attractive for production of valuable metals of industrial or nuclear interest such as rare earth elements (REEs), thorium (Th) and uranium (U). The study was focused to establish a baseline framework in viewpoint of radiation protection for the workers in production of REEs from high-grade monazite treated by sodium hydroxide (NaOH) solutions. Radiological hazard indices (cancer, gonadal and other risks) were evaluated, due to emissions (α-, β- and γ-radiations) of radium-isotopes (228Ra, 226Ra, 223Ra) and lead (210Pb). The values of the estimated radiological hazard indices were higher than the permissible safe limits, worldwide average and varied with those reported in other countries. It was found that more than 70% of radioactivity and radiological hazardous indices resulted from emissions of 228Ra, while the rest was attributed to 226Ra, 223Ra and 210Pb. Therefore, processing of the Egyptian monazite can cause a significant radiological impact on workers through external exposure from γ-radiations and/or internal exposure through inhalation or ingestion airborne contaminated by the radionuclides. Thus, the results recommended that protection rules could be considered to prevent the radiation hazards associated with the production of the REEs from the high grade monazite attacked by caustic method.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Regulatory Toxicology and Pharmacology - Volume 89, October 2017, Pages 215-223
نویسندگان
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