İzmir metrosu kapalı istasyonlarında radon aktivite konsantrasyonlarının belirlenmesi
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Dosyalar
Tarih
2017
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Ege Üniversitesi, Fen Bilimleri Enstitüsü
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
Uranyum bozunum serisinin bir ürünü olan radon renksiz, kokusuz ve radyoaktif bir soy gazdır. Ayrıca, dünya genelinde akciğer kanserinin önemli nedenleri arasında gösterilmektedir. Bu nedenle ev, işyeri, maden, mağara ve tünel gibi kapalı mekânlardaki radon gazı kaynaklı radyoaktivite seviyesinin bilinmesi önemlidir. Ancak İzmir ilinde yoğun bir şekilde kullanılan metro istasyonlarında insanların maruz kaldığı radyoaktivite düzeyi daha önce herhangi bir araştırma ile saptanmamıştır. Böylece bu araştırmada İzmir Metrosu'nun tamamen kapalı istasyonlarında (Evka-3, Ege Üniversitesi, Basmane, Çankaya, Konak, Üçyol, İzmirspor, Hatay, Göztepe, Poligon ve Fahrettin Altay) radon aktivite konsantrasyonlarının belirlenmesi amaçlanmıştır. Araştırmada nükleer iz kazıma dedektörleri (LR-115 film dedektörler) tren raylarından 50 cm yukarıda olacak şekilde uygun bir yere asılmış ve bir yıl boyunca her ay periyodik olarak yenileri ile değiştirilmiştir. Araştırma sonunda kapalı metro istasyonlarında aylık ve yıllık radon aktivite konsantrasyonları hesaplanmıştır. Ayrıca bu istasyonların peronlarında günde 8 saat çalışan personeller ve 10 dakika bekleyen yolcular için yıllık etkin doz eşdeğerleri bulunmuştur. Elde edilen veriler ulusal ve uluslararası referans değerlerle karşılaştırılmıştır. Bu araştırmanın sonucunda İzmir Metrosu'nda en düşük yıllık ortalama radon konsantrasyonu 249.03 Bqm-3 ile Konak, en yüksek yıllık ortalama radon konsantrasyonu ise 723.69 Bqm-3 ile Üçyol istasyonlarında ölçülmüştür. Tüm istasyonlarda ölçülen radon konsantrasyonlarının ortalaması ise 392,86 Bqm-3 olarak bulunmuştur. Bu değerler TAEK (2000) tarafından belirlenen referans değerin altındadır. Peronlarda günde ortalama 8 saat çalışan personeller için ortalama yıllık etkin doz eşdeğeri 4.13 mSvy-1 olup, en yüksek değer 7.61 mSvy-1 ile Üçyol, en düşük değer ise 2.62 mSvy-1 ile Konak istasyonunda ölçülmüştür. Peronlarda 10 dakika bekleyen yolcular için ise ortalama yıllık etkin doz eşdeğeri 0.086 mSvy-1 olarak bulunmuştur. Bu değerler ICRP (2007) tarafından belirlenen referans değerlerin altındadır.
Radon which is a product of Uranium decay series is a colorless, odorless and radioactive inert gas. Besides, Radon is thought that it is one of the serious reasons of the lung cancer in worldwide. For this reason, it is significant that radioactivity contribution that stems from radon should be determined for indoor areas such as houses, offices, mines, caves and tunnels. However, the level of human exposure to radioactivity has not been studied yet in metro stations which are used intensely for transportation in İzmir. So, within this thesis study, it was aimed to determine the radon activity concentrations at full-closed stations named as Evka-3, Ege Üniversitesi, Basmane, Çankaya, Konak, Üçyol, İzmirspor, Hatay, Göztepe, Poligon ve Fahrettin Altay in İzmir Metro (İzmir urban public transportation). LR-115 nuclear track or nuclear film detectors were hanged on suitable parts of the stations 50 cm above the rails and have been changed with new ones every month periodically for a year. As a result of this study, annual and monthly radon activity concentrations were calculated at closed stations. In addition, annual effective dose equivalent values were calculated for workers worked on the platforms of these stations for eight hours and for passengers waited for ten minutes. Obtained data was compared to previous local and international reference values. As a consequence of this study, the lowest mean for annual radon activity concentrations was calculated as 249.03 Bqm-3 at Konak Station and the highest mean value was 723.69 Bqm-3 at Üçyol Station. The mean of the radon concentrations calculated at all over the stations was found 392.86 Bqm-3. All these values were under the reference values determined by TAEK (2000). Average of the annual effective dose equivalent for workers working approximately 8 hours a day at the platforms was calculated as 4.13 mSvy-1 while maximum was 7.61 mSvy-1 (at Üçyol Station) and minimum was 4.13 mSvy-1 (at Konak Station). On the other hand, the average annual effective dose equivalent for passengers waited for approximately 10 minutes was 0.086 mSvy-1. All these values were under the reference values determined by ICRP (2007).
Radon which is a product of Uranium decay series is a colorless, odorless and radioactive inert gas. Besides, Radon is thought that it is one of the serious reasons of the lung cancer in worldwide. For this reason, it is significant that radioactivity contribution that stems from radon should be determined for indoor areas such as houses, offices, mines, caves and tunnels. However, the level of human exposure to radioactivity has not been studied yet in metro stations which are used intensely for transportation in İzmir. So, within this thesis study, it was aimed to determine the radon activity concentrations at full-closed stations named as Evka-3, Ege Üniversitesi, Basmane, Çankaya, Konak, Üçyol, İzmirspor, Hatay, Göztepe, Poligon ve Fahrettin Altay in İzmir Metro (İzmir urban public transportation). LR-115 nuclear track or nuclear film detectors were hanged on suitable parts of the stations 50 cm above the rails and have been changed with new ones every month periodically for a year. As a result of this study, annual and monthly radon activity concentrations were calculated at closed stations. In addition, annual effective dose equivalent values were calculated for workers worked on the platforms of these stations for eight hours and for passengers waited for ten minutes. Obtained data was compared to previous local and international reference values. As a consequence of this study, the lowest mean for annual radon activity concentrations was calculated as 249.03 Bqm-3 at Konak Station and the highest mean value was 723.69 Bqm-3 at Üçyol Station. The mean of the radon concentrations calculated at all over the stations was found 392.86 Bqm-3. All these values were under the reference values determined by TAEK (2000). Average of the annual effective dose equivalent for workers working approximately 8 hours a day at the platforms was calculated as 4.13 mSvy-1 while maximum was 7.61 mSvy-1 (at Üçyol Station) and minimum was 4.13 mSvy-1 (at Konak Station). On the other hand, the average annual effective dose equivalent for passengers waited for approximately 10 minutes was 0.086 mSvy-1. All these values were under the reference values determined by ICRP (2007).
Açıklama
Anahtar Kelimeler
Doğal Radyoaktivite, Radon, LR-115 Dedektör, Metro İstasyonları, İzmir, Natural Radioactivity, Radon, LR-115 Detector, Metro Stations
