Ardahan ilinin (Türkiye) toprak örneklerinde ortalama etkin dozun değerlendirilmesi için doğal radyoaktivite analizi

Year 2017, Volume: 21 Issue: 6, 1583 - 1590, 01.12.2017

Gülçin Bilgici Cengiz

https://doi.org/10.16984/saufenbilder.294788

Cited By: 1

Abstract

Bu çalışmada Ardahan ili yüzey topraklarında doğal radyonüklidlerin
dağılımı belirlenmiştir. Ardahan ili ve çevre ilçelerinden toplanan 35 adet
toprak örneğinin ²³⁸U, ²³²Th, ⁴⁰K ve ¹³⁷Cs
aktivite konsantrasyonları, NaI(Tl) gama spektrometresi ile ölçülmüştür. Toprak
numunelerindeki ²³⁸U, ²³²Th ve ⁴⁰K doğal
radyonüklitlerinin ortalama aktiviteleri sırasıyla, 29.9±6.2, 36.7±6.8 ve
435.1±23.9 Bq kg^-1 olarak tespit edildi. Fisyon ürünü ¹³⁷Cs
için, numunelerin ortalama aktivitesi 15.5±0.8 Bq kg^-1 olarak
belirlenmiştir. 35 adet toprak numunesinde radyonüklidlerin varlığına bağlı
olarak ortalama açık hava gama doz oranı (karasal ve kozmik) ve havadaki
ortalama yıllık etkili doz oranı sırasıyla, 56.3±8.7 nGyh^-1 ve
69.0±6.7 μSv y^-1 olarak bulunmuştur. Bu araştırma, rakım ile doğal
radyonüklidler arasında net bir korelasyon olduğunu gösterdi. Ardahan şehir
merkezi ve ilçeleri için elde edilen sonuçlar, grafiksel olarak sunulmuş ve
Türkiye ortalamaları ve dünya ortalamaları ile karşılaştırılmıştır.

Keywords

Ardahan ili, doğal radyoaktivite, toprak, gama spektrometresi, rakım

Natural radioactivity analysis in soil samples of Ardahan province, Turkey for the assessment of the average effective dose

Abstract

In this study,
the distribution of natural radionuclides in surface soils in Ardahan province
has been determined. The activity concentrations of ²³⁸U, ²³²Th,
⁴⁰K and ¹³⁷Cs in 35 soil samples collected from the
Ardahan city and its surrounded districts were measured through NaI (Tl) gamma
spectrometry. The average activities of the samples were determined to be 29.9±6.2,
36.7±6.8 and 435.1±23.9 Bq kg^-1 for the natural radionuclides ²³⁸U,
²³²Th and ⁴⁰K, respectively. For the fission product ¹³⁷Cs,
the average activity of the samples was assigned to be 15.5±0.8 Bq kg^-1.
The average outdoor gamma dose rate (terrestrial and cosmic) and also the
average annual effective dose rate in air due to the presence of radionuclides
in 35 soil samples were obtained as 56.3±8.7 nGy h^-1 and 69.0±6.7
µSv y^-1, respectively. This research showed a clear correlation
between the altitude and the natural radionuclides. The results obtained for
Ardahan city centrum and its districts were presented graphically and compared
with the world average values and those of Turkey.

Keywords

Ardahan province, natural radioactivity, soil, gamma-ray spectrometry, altitude

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