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Nefes alan canlılar için hayati önem taşıyan oksijen, dünya atmosferinin yaklaşık beşte birini oluşturur. Atmosferde yüksek sıcaklıkta bazen tek bir atom olarak ortaya çıkar, ancak genellikle moleküler oksijeni oluşturmak için ikinci bir oksijen atomu ile birleşir. Soluduğumuz havadaki oksijen öncelikle bu kararlı formdan oluşur. Oksijen ayrıca, üç oksijen atomunun ozon adı verilen tek bir molekülde birbirine bağlandığı üçüncü bir kimyasal forma sahiptir. O2’den daha az kararlı ve çok daha nadir olmasına ve esas olarak stratosferin üst seviyeleriyle sınırlı olmasına rağmen, hem moleküler oksijen hem de ozon, dünyayı güneş radyasyonunun zararlı bileşenlerinden korumada hayati bir rol oynar.

En zararlı radyasyon, güneş spektrumunun kısa dalga boylarında (3.000 Å’nin altında) gözle görülmeyen “ultraviyole” bölgesindedir. X-ışınlarının aksine, ultraviyole fotonlar atomları iyonize edecek kadar “sert” değildirler. Ancak canlı hücrelerdeki moleküllerin kimyasal bağlarını parçalamak ve tümörler ve kanserler dahil olmak üzere çeşitli biyolojik ve genetik anormallikler üretmek için yeterli enerjiyi toplayın.

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Pamukkale Turizm
Nükleer Felakette Oksijen, Ozon ve Ultraviyole Radyasyonu
Nükleer Felakette Oksijen, Ozon ve Ultraviyole Radyasyonu

Neyse ki, dünyanın atmosferi nedeniyle, bu tehlikeli ultraviyole radyasyonun yalnızca bir izi aslında dünyaya ulaşır. Güneş ışığı yaklaşık 30 mil yükseklikte stratosferin tepesine ulaştığında, 1.900 Å’den daha kısa olan radyasyonun neredeyse tamamı nitrojen ve oksijen molekülleri tarafından emilir. Stratosferin kendi içinde, moleküler oksijen, 2,420 Å’ye kadar olan daha uzun ultraviyole dalga boylarını emer ve bu absorpsiyon işlemi sonucunda ozon oluşur.

O zaman, yaklaşık 3.000 A’ya kadar kalan ultraviyole dalga boylarının neredeyse tamamını emen bu ozondur, böylece tehlikeli güneş radyasyonunun neredeyse tamamı, daha yeryüzüne ulaşmadan önce kesilir.

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Originally posted 2022-05-30 15:00:00.

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