Spatial Distribution of Thorium Concentration in Afyonkarahisar-Sandıklı-Şuhut Region

Year 2013, Volume: 17 Issue: 3, 28 - 31, 11.07.2014

Nurten Ayten Uyanık Ziya Öncü Osman Uyanık İskender Akkurt Kadir Günoğlu Mustafa Bozcu Fuzuli Yağmurlu

Abstract

Although at least 20 elements are known as natural radioactive, only U (Uranium), Th (Thorium) and K (Potassium) are important elements in nuclear geophysics. Stable nucleus of 232Th is Pb and in this chain there are 10 isotopes. 208Tl decay chain produces characteristic gamma radiation (2.62 MeV). The 232Th concentrations have been measured using portable gamma-ray spectrometer, for about 180 seconds counting times at 1169 points with known geographical coordinates. The variation of eTh concentration has been mapped in Afyonkarahisar district (Sandıklı, Şuhut, Haydarlı). eTh concentration values ranged between 0-80 ppm with different regional lithology. It should be noted that high concentration values were obtained in volcanic rocks and altered volcanic zones

Keywords

Gamma-ray spectrometry, Afyon volcanics, Thorium, Concentration, Alteration

Afyon-Sandıklı-Şuhut Arasındaki Bölgenin Toryum Konsantrasyonunun Alansal Dağılımı

Abstract

Doğal radyoaktif element olarak bilinen en az 20 adet element olmasına rağmen, nükleer jeofizikte sadece U (uranyum), Th (toryum) ve K (potasyum) elementleri önemlidir. Radyoaktif 232Th ile başlayan toryum serisi, ortalama 10 bozunum ürününü takiben, radyoaktif 208Tl izotopunun beta bozunumu sonucunda kararlı 208Pb izotopu ile son bulur. 208Tl'in bozunum sürecinde yayınlanan 2.62 MeV enerjili gama ışınları bir gama-ışın spektrometresi ile belirlenebilir. Bu çalışmada portatif bir gama-ışın spektrometresi ile 232Th bozunum serisinin 2.62 MeV enerjili karakteristik gama ışımaları, 3'er dakikalık sayımlarla koordinatları belirlenen 1169 noktada ölçülmüştür. Afyon Merkez, Sandıklı, Şuhut ve Haydarlı arasında kalan alanda eTh konsantrasyon dağılımı haritalanmıştır. Kayaç türlerinin yayılımına bağlı olarak konsantrasyon değerlerinin 0-80 ppm aralığında değiştiği görülmüştür. Yüksek değerlerin volkanik kayaçlar üzerinde özellikle de volkanik kayaçların ayrışmaya uğramış kesimlerinde elde edilmesi dikkat çekicidir.

Keywords

Gamma-ışın spektrometresi rağmen, nükleer jeofizikte sadece U (uranyum), Th (toryum) ve K (potasyum)

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