Bulgaristan-Türkiye Sınır Bölgesinden Toplanan Topraklarda 137Cs Konsantrasyonu

Chernobyl kazası yapay radyoaktif kirliliğe, özellikle yapay 137Cs radyonüklid kirliliğine neden olmuştur. 137Cs, uzun yarılanma ömrüne sahip olması nedeniyle hala topraklarda bulunmaktadır. Bu çalışmada, yüzey toprak örnekleri Bulgaristan-Türkiye sınırında farklı konumlardan toplanmıştır. Toplanan topraklarda 137Cs aktivite konsantrasyonları hesaplanmıştır. Radyolojik tehlikeyi belirlemek için doz oranları ve yıllık etkin doz oranları tahminleri yapılmıştır. Topraklardaki yapay 137Cs radyonüklid aktivite konsantrasyonları 1.71±0.18 Bq kg−1 ile 6.99±0.66 Bq kg−1 aralığında bulunmuştur. Soğurulan doz oranları, açık hava ve bina içi yıllık etkin doz oranlarının ortalama değerleri sırasıyla 0.10, 4.19, and 16.77 µSv y−1 bulunmuştur. Doz oranları ve yıllık etkin doz oranları, UNSCEAR ve ICRP tarafından raporlanan dünya genelindeki limit değerlerinden daha düşüktür. Ek olarak, istatistiksel veriler hesaplanmış, 137Cs dağılımını belirlemek için frekans dağılımı ve Q-Q çizimi kullanılmıştır.

Anahtar Kelimeler:

137Cs, Yapay radyonüklidler, Toprak, Aktivite konsantrasyonu, HPGe dedektör.

137Cs Concentration In Soils Collected From Bulgaria-Turkey Border Region

The Chernobyl accident caused artificial radioactive contamination, especially artificial 137Cs radionuclide contamination. Due to having long half-life, 137Cs still continues to remain in soils. In the present study, the surface soil samples were collected from various locations in Bulgaria-Turkey border. The activity concentrations of 137Cs in collected soil samples were determined. In order to investigate the radiological hazard; the dose rates and the annual effective dose rates were estimated. The activity concentrations of artificial 137Cs radionuclide in soils were found to range from 1.71±0.18 Bq kg−1 to 6.99±0.66 Bq kg−1. The mean values of absorbed dose rates, outdoor and indoor annual effective dose rates were found to be 0.10, 4.19, and 16.77 µSv y−1, respectively. The dose rates and the annual effective dose rates were below the worldwide limit values reported by UNSCEAR and ICRP. In addition, statistical data were estimated, frequency distribution and Q-Q plot were used to assess 137Cs distribution.

Keywords:

137Cs, Artificial radionuclides, Soil, Activity concentration, HPGe detector.,

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