Determination of Natural Radioactivity and Radiological Effects in some Soil Sampl es in Beykoz Istanbul

Abstract

It is important to measure natural radioactivity which existed since the creation of universe. Thus in this study, 226 Ra, 232 Th, 40 K concentrations were calculated at different sampling points in Beykoz district of Istanbul using HPGe detector. As a result of the measurements, the concentration of radium, thorium, potassium level have been found to be varied from 27.75 BqKg 1 to 63.79 BqKg 1 , 30.74 BqKg 1 to 89.75 BqKg 1 and 533.73 BqKg 1 to 912.12 BqKg 1 respectively. In addition, radium equivalent (Ra eq ), absorbed gamma dose rate (D), annual effective dose equivalent, (AEDE), excess lifetime cancer risk (ELCR) were calculated in the stud y. All of the calculations have been compared with both national an d international standards and similar studies.

Keywords

• Soil,Natural radioactivity,Beykoz,Cancer Risk

İstanbul-Beykoz’daki Bazı Toprak Örneklerinde Doğal Radyoaktivite ve Radyolojik Parametre Tayini

Abstract

Evrenin ilk yaratılışından beri var olan doğal radyasyonun belirlenmesi oldukça önemlidir. Bu amaçla bu çalışmada İstanbul’un Beykoz ilçesinde farklı örnekleme noktaları belirlenerek doğal radyoaktivite ( 226 Ra, 232 Th, 40 K) konsantrasyonları HPGe detektör kullanılarak hesaplanmıştır. Yapılan ölçümler sonucunda, radyum konsantrasyonu 27,75 BqKg 1 ile 63,79 BqKg 1 arasında, toryum konsantrasyonu 30,74 BqKg 1 ile 89,75 BqKg 1 arasında, potasyum konsantrasyonu 533, 73 BqKg 1 ile 912,12 BqKg 1 arasında değiştiği bulunmuştur. Ayrıca çalışmada, radyum eşdeğeri (Ra eq ), soğrulan gama doz hızı (D), yıllık etkin doz değeri, (AEDE), yaşam boyu kanser riski (ELCR) miktarları hesaplanmıştır. Elde edilen hesaplamaların tamamı hem ulusal hem de uluslar arası standartlarla ve yapılmış olan benzer çalışmalarla karşılaştırılmıştır.

Keywords

• Toprak,Doğal radyoaktivite,Beykoz,Kanser Riski

Thanks

Yazar, bu çalışmadaki ölçümlerin yapılması için gamma spektrometresinin kullanılmasında ve makalenin hazırlanmasında yardımlarını esirgemeyen Doç. Dr. Serpil AKÖZCAN’a teşekkür eder.

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