ارزیابی سطوح تابش هسته‌های پرتوزای طبیعی در معدن سرب روی کوشک، ایران

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه فیزیک، دانشکده علوم پایه، دانشگاه اراک، اراک، ایران

2 گروه فیزیک، دانشکده علوم پایه، دانشگاه یزد، یزد، ایران

چکیده

در این پژوهش سطح پرتوزایی طبیعی  کان­سنگ معدن روی- سرب کوشک یزد تعیین گردید و خطرات رادیولوژیکی مرتبط با آن محاسبه شد. فعالیت‌های ویژه هسته­ های 226Ra،  232Th و  40K در سنگ معدن Zn-Pb با استفاده از سیستم آشکارساز ژرمانیوم با خلوص بالا(HPGe ) و شاخص‌های خطرات رادیولوژیکی فعالیت معادل رادیوم (Raeq)، شاخص‌های خطرپذیری خارجی و داخلی (Hin, Hex)، اندازه‌گیری شد. شاخص پرتوزایی گاما (Iγ)، نرخ دز جذبی در هوا (D)، دز موثر سالانه (AED)، دز معادل سالانه غدد جنسی  (AGDE)و خطر ابتلا به سرطان در طول عمر (ELCR)  محاسبه گردید. میانگین 226Ra،  232Th و  40K در کان­سنگ Zn-Pb به­ ترتیب 32/5± 12/37 ، 43/5±66/14 و 18/21±56/293 Bq/kg به دست آمد. هم­چنین میانگین پارامترهای خطر رادیولوژیکی مانند Raeq، Hex، Hin، D، AED، AGDE و Iγ در محدوده ایمن به دست آمد. میانگین ELCR برای سنگ روی- سرب، ضایعات معدن و خاک اطراف به ترتیب  3-10 ×15/0، 3-10 ×15/0و 3-10 ×23/0بود که کم­تر از میانگین جهانی 3-10 ×29/0 بود. این مطالعه نشان داد که سطح رادیواکتیویته در ناحیه سنگ معدن Zn-Pb از مقدار بحرانی فراتر نرفته و با نتایج جهانی مطابقت دارد.علی­رغم این­که سری های واپاشان طبیعی به سرب منتهی می شوند تغییر معناداری در میانگین فعالیت عناصر پرتوزای طبیعی مشاهده نگردید. علاوه بر این، شاخص‌های محاسبه‌شده خطر تشعشع نشان داد که سنگ معدن روی سرب برای کارگران معدن بی‌خطر بوده و خطر رادیولوژیکی قابل‌توجهی برای آن­ ها ایجاد نمی‌کند.
 

کلیدواژه‌ها

عنوان مقاله [English]

Evaluation of radiation levels of natural radionuclides in the lead-zinc mine of Kushk, Iran

نویسندگان [English]

  • Reza Pourimani 1
  • Mansoureh Tatari 2
  • Sahar Mandegari Meimandi 2
  • Monire Mihebian 1
1 Department of Physics, Faculty of Science, Arak University, Arak, Iran
2 Department of Physics, Faculty of Science, Yazd University, Yazd, Iran
چکیده [English]

The natural level of radioactivity in the Zn-Pb ore at the Yazd mine was determined and the associated radiological hazards were assessed. Specific activities of 226Ra, 232Th, and 40K radionuclides in the Zn-Pb ore were measured using a high purity germanium detector (HPGe) system and radiological hazards indices as radium equivalent activity (Raeq), external and internal hazard indices (Hex), gamma representative levels index (Iγ), adsorption dose rate in the air (D), annual effective dose (AED), annual gonadal dose equivalent (AGDE) and excess lifetime cancer risk (ELCR) were calculated. The average specific activities of 226Ra, 232Th, and 40K radionuclides in Zn-Pb ore were obtained as 37.12±5.32, 14.66±5.43, and 293.56±21.18 Bq/kg, respectively. These values ​​were less than the global average, except for the 226Ra activity value, which was close to the global average. Also, the average radiological risk parameters, such as Raeq, Hex, Hin, D, AED, AGDE, and Iγ were obtained in a safe range. The mean ELCR for Zn-Pb ore, mine waste, and the surrounding soil was 0.15 × 10-3, 0.15 × 10-3 and 0.23 × 10-3, respectively, which was lower than the global average 0.29 × 10-3. The study showed that the level of radioactivity in the Zn-Pb ore zone did not exceed the critical value and is in line with the global results. Moreover, the calculated indicators of radiation hazard showed that lead zinc ore is safe for mine workers and does not pose a significant radiological hazard to them.
 

کلیدواژه‌ها [English]

  • Zn-Pb ore
  • natural radioactivity
  • radiological hazard
  • HPGe

مراجع

1. UNSCEAR (United Nations Scientific Committee on the Effects of Atomic Radiation). Sources and effects of ionizing radiation report to general assembly with scientific Annexes. New York, United Nation Publication, 1993.
2. P. Singh, N. Rana, A. Naqavi, D. Rivastava. Levels of uranium in water from some Indian cities determined by Fission Track Analysis. Radiation Measurements. 26 (5) (1996) 683-7.
3. R. B. Firestone, V. S. Shirley, C. M. Baglin. Table of isotopes CD-ROM. 8th edn, Version, 1996.
4. UNSCEAR. Sources and Effects of Ionizing Radiation. Report to the General Assembly, with scientific annexes. 1 (2010) 1-219.
5. K. Iwaoka, K. Tagami, H. Yonehara. Measurement of natural radioactive nuclide concentrations in various metal ores used as industrial raw materials in Japan and estimation of dose received by workers handling them. Environ. Radio. 100 (11) (2009) 993-7.
6. R. Pourimani, M. Mortazavi Shahroodi. Radiological Assessment of the Artificial and Natural Radionuclide Concentrations of Wheat and Barley Samples in Karbala, Iraq. Med. Phys. 15 (2018) 126-131.
7. R. Pourimani, H. Azimi. Gamma spectrometric analysis of iron ore samples of Arak, Iran. Med. Phys. 13 (3) (2016) 174-182.
8. R. Pourimani, R. Ghahri, M. R. Zare. Natural radioactivity concentrations in Alvand granitic rocks in Hamadan, Iran. Radiat. Prot. Environ. 2014.
9. S. S. Behbahani, P. Moarefvand, K. Ahangari. Unloading scheme of Angooran mine slope by discrete element modeling. Rock. Mech. Min. Sci. (2013) 220-227.
10. Lead and Zinc Statistics, Monthly bulletin of the international lead and zinc study group, 41 (8) (2000).
11. M. Tatari, R. Pourimani, S. M. Meimandi, M. R. S. Yazdi, H. Lookzadeh. Risk assessment of natural radionuclide contamination in Lead–Zinc sulfide ores mining. Sci. Technol. Trans. Sci. 45 (2020) 383–389.
12. A. Yaghubpur, B. Mehrabi. A typical black-shale-hosted deposit in Yazd state. Sci Islam. Repub. Iran. 8 (1997) 117-125.
13. A. H. Dahooei, P. Afzal. M. Lotfi, A. Jafarirad. Identification of mineralized zones in the Zardu area, Kushk SEDEX deposit (Central Iran), based on geological and multifractal modeling. Open Geosciences. 8(1) (2016) 143-153.
14. IAEA-TECDOC-1360, Collection and preparation of bottom sediment samples for analysis of radionuclides and trace elements. International Atomic Energy Agency, 2016.
15. R. Pourimani, M. Mohebian. Study of background correction of gamma-ray spectrometry using reference materials. Sci. Technol. Trans. Sci. 45 (2021) 733–736.
16. Preparation and certification of IAEA gamma-ray spectrometry, reference materials RGU-1, RGTh-1 and RGK-1, IAEA/RL/148(1987).
17. M. Gilmore. Practical Gamma Ray Spectrometry, 2nd ed, Warrington, UK: John Wiley and Sons, Ltd. 2008.
18. Live Chart of Nuclides nuclear structure and decay data ms (1978) available from: https://nds.iaea.org/relnsd/vcharthtml/VChartHTML.html
19. R. Pourimani, T. Davoodmaghami. Radiological hazard resulting from natural radioactivity of soil in east of Shazand power plant. Med. Phys. 15 (2018) 192-199.
20. UNSCEAR (United Nations Scientific Committee on the Effects of Atomic Radiation) Sources and effects of ionizing radiation report to general assembly with scientific Annexes. New York, United, 2008.
21. ICRP Protection of the Public in Situations of Prolonged Radiation Exposure ICRP Publication 82, 1989.
22. OECD Exposure to radiation from the natural radioactivity in building materials. Report by a Group of Experts of the OECD. Nuclear Energy Agency, Paris, France, 1979.
23. M. M. Mukaka. Statistics Corner: A guide to appropriate use of Correlation coefficient in medical research. Malawi Med. 24 (3) (2012) 69-71.
24. European Commission (EC) Radiological protection on principles concerning the natural radioactivity of building materials. Radia on Protec on 112, Official Public on SOF the European Communi es, Directorate- General Environment. Nuclear safety and civil Protection, 1999.
25. J. Beretka, P. J. Matthew. Natural radioactivity of Australian building materials, industrial wastes and byproducts. Health phys. 48 (1) (1985) 87-95.
26. R. Pourimani, F. A. Anoosheh. study on transfer factors of environmental radionuclides radionuclide transfer from soil to different varieties of rice in Gorgan, Iran. Med. Phys. 12 (3) (2015) 189-99. 

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