Assessment of radiological hazards and lifetime cancer risk in some marble samples from the Marmara Region

Öz

In this study, ²²⁶Ra, ²³²Th and ⁴⁰K concentrations were measured by gamma spectrometry system to determine the natural radioactivity levels in some marbles mining from the Marmara Region.  Mean activity concentrations of ²²⁶Ra, ²³²Th and ⁴⁰K  in marble samples were measured as 37.446, 34.593 and 248.041 Bq / kg, respectively.  The absorbed dose rate (D), annual effective dose equivalent(YEDE), radium equivalent activity (Ra_eq), internal hazard index (Hi) and external hazard index (Hd) values were calculated using the ²²⁶Ra, ²³²Th, ⁴⁰K activity concentrations obtained as a result of the measurements.  In addition, lifetime cancer risk (LCR), which is a consequence of radiation exposure, has been calculated. All the results obtained are compared with the limit values recommended by international organizations.  According to these results, it can be concluded that there is no harm in terms of both radiological damage indices and dose parameters.

Anahtar Kelimeler

• Natural radioactivity,radiological hazard,lifetime cancer risk,marble

Marmara Bölgesi'ndeki bazı mermer örneklerinde radyolojik tehlikelerin ve yaşam boyu kanser riskinin değerlendirilmesi

Öz

Bu çalışmada, Marmara Bölgesi’ nden çıkarılan bazı mermerlerdeki doğal radyoaktivite seviyelerini belirlemek için ²²⁶Ra, ²³²Th ve ⁴⁰K konsantrasyonları gama spektrometre sistemi ile ölçülmüştür.  Mermer numunelerindeki ²²⁶Ra, ²³²Th ve ⁴⁰K ortalama aktivite konsantrasyonları, sırasıyla 37.446, 34.593 ve 248.041 Bq / kg olarak ölçülmüştür.  Ölçümler sonucunda elde edilen ²²⁶Ra, ²³²Th, ⁴⁰K aktivite konsantrasyonları kullanılarak soğurulan gama doz hızı (D), yıllık etkin doz eşdeğeri (YEDE), radyum eşdeğer aktivitesi (Ra_eq), iç tehlike endeksi (Hi) ve dış tehlike endeksi (Hd) değerleri hesaplanmıştır.  Bunların yanı sıra, radyasyon maruziyetinin bir sonucu olan yaşam boyu kanser riski (LCR) hesaplanmıştır.  Elde edilen tüm sonuçlar uluslararası kuruluşlar tarafından önerilen limit değerler ile karşılaştırılmıştır.  Bu sonuçlara göre, hem radyolojik zarar indeksleri açısından hem de doz parametreleri açısından hiç bir zarar teşkil etmediği sonucuna varılabilir.

Anahtar Kelimeler

• Doğal radyoaktivite,radyolojik tehlike,yaşam boyu kanser riski,mermer

Kaynakça

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