مطالعات هیدرو‌ژئوشیمیایی و پرتوسنجی مواد رادیواکتیو در مناطق آیرکان و چشمه شتری (شمال شرق استان اصفهان)

زمین شناسی اقتصادی

مقاله 3، دوره 3، شماره 2 - شماره پیاپی 5، بهمن 1390، صفحه 147-163   

نوع مقاله: علمی- پژوهشی

شناسه دیجیتال (DOI): 10.22067/econg.v3i2.11423

نویسندگان

مصطفی اسماعیلی وردنجانی^{* 1}؛ رضا شمسی پور دهکردی¹؛ کاوه پازند²؛ داود رهی¹

¹اصفهان

²آزاد اسلامی واحد علوم و تحقیقات

چکیده

هیدروشیمی آبهای زیرزمینی مناطق آیرکان و چشمه شتری و ژئوشیمی عناصر نادر خاکی، آلکالی گرانیت آیرکان را به عنوان منشأ اورانیوم و سایر عناصر محلول در آبهای زیرزمینی این مناطق نشان می‌دهد. بررسیهای ژئوشیمیایی و هیدروژئوشیمیایی و روند انتقال و تحّرک اورانیوم و توریم در محیطهای آبی این مناطق، اشاره به جذب سطحی اورانیوم توسط هیدروکسید‌های آهن (گوتیت) به عنوان عاملی بازدارنده در برابر انتقال و حمل اورانیوم از اعماق به سطح دارند. طیف سنجی پرتو گاما در رسوبات منطقه چشمه شتری توسط آشکار ساز HPGe، نشان دهنده حضور 226Ra به میزان بسیار زیاد و به عنوان هسته پرتوزا می‌باشد که دلیل اکتیویته بسیار بالای این رسوبات نیز هست. تولید 226Ra از واپاشی 238U، نیمه‌عمر کوتاه 226Ra نسبت به 238U، انتقال رادیوم توسط آبهای زیرزمینی از اعماق به سطح و شواهد (هیدرو)ژئوشیمیایی، همگی بیانگر احتمال حضور کانسار مخفی اورانیوم و کانه‌زایی اورانیوم در عمق و در حدفاصل گرانیت آیرکان و منطقه چشمه شتری است.

کلیدواژه‌ها

مناطق آیرکان و چشمه شتری؛ اورانیوم؛ توریم؛ جذب سطحی؛ طیف سنجی پرتو گاما؛ هسته پرتوزا

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