60Co Radyoaktif Nokta Kaynaği ile Uçucu Külün Gama Radyasyon Koruma Özellikleri

Öz

Gelişmekte olan beton teknolojisi sayesinde hafif beton ve uçucu kül betonla ilgili birçok alanda kullanılabilmektedir. Dünyanın güncel sorunlarından olan radyasyondan, korunmak için birçok araştırmacı uçucu külü kullanmış fakat çok az sayıda araştırmacı hafif beton üzerinde çalışmıştır. Radyasyonun etkilerinden korunmak için araştırmacılar ağır beton ve ağır agregalar kullanılarak gama ışını soğurma miktarlarını incelenmiştir. Bu çalışmada c sınıfı uçucu kül, çimento yerine %30-50-100 dozajlarında kullanılarak 3 farklı hafif beton hazırlanmıştır. 50*50*50 mm boyutlarında hazırlanan kompozit bloklar üzerinde yoğunluk ve basınç dayanımı deneyleri yapılmış, doğrusal zayıflama katsayısı (cm-1), kütle zayıflama katsayısı (MAC) ve onuncu katman değeri (TVL) (cm) gibi radyasyon etkileşim parametreleri ölçülmüştür. Radyasyon etkileşim parametreleri HP Ge gama dedektörü kullanılarak elde edilmiştir. Radyasyon ölçümleri için 1173 keV (60Co) ve 1332 keV (60Co) olarak 2 farklı foton enerjisi kullanılmıştır. Yapılan çalışmalar sonucunda uçucu kül içeriği arttıkça basınç dayanımının azaldığı, hazırlanan kompozitlerinden %100 uçucu kül içeren örneklerin basınç dayanımının en az olduğu, uçucu kül miktarı düştükçe yoğunluğun arttığı belirlenmiştir. Hazırlanan kompozitlerde enerji seviyeleri arttıkça doğrusal zayıflama katsayısı arttığı görülmüştür. Bu çalışma sayesinde birçok alanda kullanılan uçucu küllerin radyasyon kalkanı olarak kullanılabileceği ortaya konmuştur. Ayrıca bu çalışma ile radyasyon kalkanı üretiminde, ağır agrega kullanılmaması ve hafif beton üretilmesi nedeni ile kalkan üretim maliyeti önemli derecede düşecektir.

Anahtar Kelimeler

• Doğrusal zayıflama katsayısı
• Gamma radyasyon kalkanı
• Hafif beton
• Uçucu kül

Gamma Radiation Shielding Properties of Fly Ash With 60Co Radioactive Point Source

Öz

With the help of the developing concrete technology, light concrete and fly ash may be used in several concrete-related fields. In this study, by using Class C fly ash at the doses of 30-50-100% instead of cement, 3 different light concretes were prepared. Density and compressive strength experiments were conducted on the composite blocks prepared with dimensions of 50*50*50 mm, and linear absorption coefficients (cm-1), mass attenuation coefficients (MAC) and Tenth value layer (TVL) radiation interaction parameters were measured. Radiation interaction parameters were obtained using an HP Ge gamma detector. For radiation measurements, 2 different photon energies as 1173 keV (60Co), and 1332 keV (60Co) were used. As a result of the analyses, it was determined that compressive strength decreased as the fly ash content increased, the lowest compressive strength values were obtained in the samples containing 100% fly ash among the prepared composites, and density increased as the fly ash content decreased. It was observed that, in the prepared composites, as the energy levels increased, the linear absorption coefficients also increased. With this study, it was revealed that fly ashes that are used in many fields could be used as a radiation shield. Additionally, with this study, due to not using heavy aggregates and due to production of light concrete in the production of radiation shields, the cost of shield production will significantly decrease

Anahtar Kelimeler

• Liner absorption
• Gamma radiation shielding
• Lightweight concrete
• Fly ash

Kaynakça

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