کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
580584 | 1453152 | 2010 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Hazard of NORM from phosphorite of Pakistan
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
بهداشت و امنیت شیمی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Hazard of NORM from phosphorite of Pakistan Hazard of NORM from phosphorite of Pakistan](/preview/png/580584.png)
چکیده انگلیسی
In order to investigate the radiological hazard of naturally occurring radioactive material (NORM) in phosphorite deposits of Pakistan, 26 samples of phosphorite were collected from the phosphorite mines near Abbottabad, and 20 samples of single superphosphate (SSP) fertilizer were obtained from the warehouses in Pakistan. Activity concentration in all the samples was assayed using HPGe detection system. Specific activity values of 238U, 40K, 226Ra and 232Th in the samples of phosphorite were 550 ± 156 (329-845), 206 ± 72 (93-362), 511 ± 189 (316-830) and 52 ± 17 (23-81) Bq kgâ1, respectively; and those in SSP fertilizer due to these radionuclides were 637 ± 44 (596-687), 164 ± 24 (113-215), 589 ± 44 (521-671) and 29 ± 6 (16-45) Bq kgâ1, respectively. The results were compared with that of worldwide soil. Outdoor external dose rate due to gamma rays from phosphorite was calculated to be 276 ± 94 (177-441) nGy hâ1 and external dose rate in a room made of phosphorite containing material was estimated to be 706 ± 243 (455-1129) nGy hâ1. The concentration of radon was measured in phosphorite mines and in the warehouses for SSP fertilizer by an active method. Protective measures have been proposed to control the pollution in the phosphorite mining and processing, and fertilizer storage areas.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hazardous Materials - Volume 176, Issues 1â3, 15 April 2010, Pages 426-433
Journal: Journal of Hazardous Materials - Volume 176, Issues 1â3, 15 April 2010, Pages 426-433
نویسندگان
Sabiha-Javied Sabiha-Javied, M. Tufail, M. Asghar,