سنجش پرتوزایی ویژه‌هسته‌های پرتوزای طبیعی و مصنوعی و محاسبه خطرات پرتوشناختی مربوط به آن‌ها در آب آشامیدنی منطقه اصفهان

نویسندگان

گروه فیزیک، دانشکده علوم پایه، دانشگاه اراک، اراک، مرکزی

چکیده

آب سالم یکی از نیازهای اساسی انسان است که باید عاری از آلودگی باشد. یکی از آلاینده‌های آب هسته‌های پرتوزا است که به‌طور طبیعی و مصنوعی در محیط وجود دارد. بنابراین، اندازه‌گیری دقیق پرتوزایی آب بسیار مهم است. پرتوزایی ویژه 226Ra، 232Th، 40K و 137Cs در 26 نمونه آب آشامیدنی منطقه اصفهان با طیف‌سنجی گاما با استفاده از یک آشکارساز ژرمانیوم با خلوص بالا (HPGe) اندازه‌گیری شد. پرتوزایی ویژه 226Ra برای همه نمونه‌ها زیر حد قابلیت تشخیص بود. میانگین پرتوزایی ویژه 232Th و 40K برحسب بکرل بر لیتر (Bq/l) به‌ترتیب 40/1 و 23/82 اندازه‌گیری گردید. دزهای مؤثر سالانه در نتیجه مصرف آب حاوی هسته‌های پرتوزا برای افراد بالغ برحسب میکروسیورت بر سال (μSv/y) برای 232Th از 317/0 تا 153/1 با متوسط 784/0، 40K از 059/0 تا 150/0 با میانگین 114/0 و 137Cs از 001/0 تا 016/0 با میانگین 003/0 به‌دست آمد. ضریب ریسک ابتلا به سرطان برای سه گروه سنی تعیین گردید که برای افراد بزرگسال عدد 6-10× 59/1 به‌دست آمد. نتایج نشان داد که دز مؤثر معادل سالانه در نتیجه مصرف آب آشامیدنی کمتر از معیار دز فردی ناشی‌ از مصرف آب آشامیدنی تعیین شده توسط سازمان بهداشت جهانی (WHO) و μSv/y 100 است. بنابراین برای ساکنان این منطقه تهدیدی ندارد و از کیفیت مناسبی برخوردار است.
 

کلیدواژه‌ها

عنوان مقاله [English]

Measurement of specific radioactivity of natural and artificial radioactive nuclei and calculation of radiological hazards related to them in drinking water of Isfahan region

نویسندگان [English]

  • Reza Pourimani
  • Somayeh Karimi-Khuzani
  • Monire Mohebian
چکیده [English]

Safe water is one of the basic needs of humans that must be free of any contamination. One of the water pollutants is radioactive nuclei, which naturally and artificially occur in the environment. Therefore, accurate measurements of water radioactivity are very important. The activity concentration of 226Ra, 232Th, 40K, and 137Cs in 26 drinking water samples from the Isfahan province was measured by gamma spectrometry using a high purity germanium detector (HPGe). Activity concentrations of 226Ra for all samples were below the detection limit. The average specific activity of radionuclides 232Th, 40K and 137Cs were measured as 1.40, 82.23 and 0.0.40 respectively in Bq/l. Annual effective doses as a result of ingestion of water containing 232Th, 40K and 137Cs radionuclides for adults ranged from 0.317 to 1.153 with an average of 0.784, from 0.059 to 0.150 with an average of 0.114 and from 0.001 to 0.016 with an average of 0.003 in μSv/y respectively. The excess lifetime cancer risk was calculated for three age groups, which was 1.59 ×10-6 for adults. The results showed that the annual effective dose as a result of drinking water consumption was lower than the WHO Individual Dose Criterion (100 μSv/y), so it does not pose a threat to the inhabitants of this area and has good quality.

کلیدواژه‌ها [English]

  • Drinking water
  • Radionuclide
  • Dose
  • Excess lifetime cancer risk
  • Gamma-ray spectrometry

مراجع

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