The surveys of natural gamma-emitting radionuclides in rocks and soils from the Ezine plutonic area were conducted during 2007. Direct dose measurement using a survey meter was carried out simultaneously. The present study, which is part of the survey, analysed the activity concentrations of (238)U, (232)Th and (40)K in granitoid samples from all over the region by HPGe gamma spectrometry. The activity concentrations of (226)Ra ranged from 94 to 637 Bq kg(-1), those of (232)Th ranged from 120 to 601 Bq kg(-1)and those of (40)K ranged from 1074 to 1527 Bq kg(-1) in the analysed rock samples from different parts of the pluton. To evaluate the radiological hazard of the natural radioactivity in the samples, the absorbed dose rate (D), the annual effective dose rate, the radium equivalent activity (Ra(eq)) and the external (H(ex)) hazard index were calculated according to the UNSCEAR 2000 report. The thorium-to-uranium concentration ratios were also estimated.
ÖzSon yıllarda ofislerde meydana gelen meslek hastalıklarının artması ofis ortamı risk etmenlerinin daha detaylı araştırılması, incelenmesi gerekliliğini ortaya koymuştur. Ofis ortamı, az tehlikeli işler sınıfında değerlendirilse de uzun vadede yarattığı dramatik sonuçlar yönünden ofis ortamındaki/bina içi ortamdaki radyasyon riski değerlendirilmelidir. Bu kapsamda sunulan "Güvenli Çalışma Ortamları için Radyasyon Riskinin Değerlendirilmesi" başlıklı bu çalışmada, Ege Üniversitesi kampüsünde öğrenci yoğunluğunun çok olduğu kütüphane, laboratuvar vb. alanlarda iyonlaştırıcı radyasyon kaynağı radon ve iyonlaştırıcı olmayan radyasyon (EMA) ölçümleri yapılarak, sonuçlar ulusal ve uluslararası sınır değerler ile karşılaştırılmış, çalışma alanlarının İş Sağlığı ve Güvenliği yönünden uygunluğu değerlendirilmiştir.
In the current study, it was shown that polystyrene (PS) composites holding tungsten (VI) oxide were formed in groups (10% to 50%) by radical polymerization. For this goal, the styrene reacted with BPO for 2.5 hours at 70 °C in tetrahydrofuran (THF) to give the consistent polymer. Synthesized PS were defined by FTIR, GPC (Mn = 7900 g/mol PDI = 1.66), SEM and 1H NMR spectroscopy. PS-tungsten (VI) oxide composites formed between 80-85°C. The gamma-ray of composites was calculated using the NaI(Tl) scintillation detector. Linear attenuation coefficients were also estimated hypothetically by the XCOM platform, taking into account the fundamental analysis of composites and comparing them with empirical outcomes. Among the composites studied, the best protective material was PS -50% W03 with lower absorption thicknesses and a higher linear slimming coefficient. Thermal degradation of unirradiated and irradiated polymer composites has also been examined.
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