MUĞLA’DA KULLANILAN İNŞAAT MALZEMELERİNİN 226Ra, 232Th VE 40K AKTİVİTE DERİŞİMLERİ VE RADYOLOJİK ZARARLARI

Bu çalışmada sık kullanılan bazı inşaat malzemelerinin içerdiği doğal gama yayıcı radyonüklitlerin aktivite derişimleri yüksek çözünürlüklü gama spektrometresi ile ölçülmüştür. Türkiye’nin güney batısında (Muğla) bulunan yapı malzemeleri tedarikçilerinden toplanan örneklerin 40K, 226Ra ve 232Th içeriklerinden kaynaklanabilecek radyasyon zararları belirlendi. Radyum eşdeğer aktivitesi, dâhili/harici zarar indisleri, alfa/gama indeksleri ve kapalı alanda absorplanan doz miktarları gibi farklı kriterler hesaplandı. Elde edilen sonuçlardan, çimento ve tuğla örneklerinin kapalı alan absorblanan doz miktarının dünya popülasyon ağırlıklı ortalamasından yüksek olduğu ancak radyum eşdeğer aktivitelerinin, dahili/harici zarar indislerinin ve alfa/gama indekslerinin önerilen maksimum güvenlik limitlerinin altında olduğu görüldü. Mermer örnekleri için ise tüm kriterlerin UNSCEAR tarafından önerilen güvenlik limitlerinin altında olduğu belirlendi. Sonuç olarak incelenen yapı malzemelerinin kullanımında insan sağlığı açısından bir sakınca olmadığı görüldü.

Anahtar Kelimeler:

Yapı malzemesi, doğal radyoaktivite, radyolojik tehlike , gama spektrometresi

226Ra, 232Th and 40K ACTIVITY CONCENTRATIONS AND RADIOLOGICAL HAZARDS OF BUILDING MATERIALS IN MUGLA, TURKEY

The activity concentrations of natural gamma-emitting radionuclides in commonly used building materials were measured by using high purity germanium (HPGe) detector coupled with a high resolution multichannel analyser. The results associated radiation hazards due to 40K, 226Ra and 232Th have been determined in samples collected randomly from southwest part of Turkey. When the building materials such as clay brick, marble, cement etc. originating from soil and rocks are used in constructions they cause direct ionizing radiation exposure at varying intensities. Different criterion formulas as radium equivalent activity, the external/internal hazard indices, the alpha/gamma indexes and the absorbed dose rate in indoor air were determined to assess the radiation hazards arising due to the use of materials studied for people living in the construction of dwellings made of the these materials. Although indoor absorbed dose rate is relatively higher than the world population-weighted average value and international limit for studied brick and cement samples they could be used safely as building materials because radium equivalent activity, alpha/gamma indices and hazard indices of those materials have been found to be within the recommended limits. All the values for all criterion formulas for marble samples are found to be well below the safety limits recommended by UNSCEAR. It can be concluded that examined materials can be used for construction of buildings for interior and external works.

Keywords:

Building materials, natural radioactivity, radiological hazard, gamma-ray spectrometry,

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