NATURAL RADIOACTIVITY OF THE COASTLINE OF ÇEŞME-İZMİR ABSTRACT

Yıl 2018, Cilt: 16 Sayı: 1/2, 167 - 186, 16.05.2018

Filiz Gür , Mehmet Tarakçı

Öz

Türkiye,
Avrupa'nın en büyük plaj kum sistemine sahip ülkesidir. 8333 km uzunluğundaki
(toplam sahilin yaklaşık % 10'u) toplam sahillerin 845 km'lik kısmı plaj
kumları ile kaplıdır. Plaj kumları mineral yatakları olup genellikle magmatik
kayaçlardan kaynaklanmaktadır. Dolayısıyla, plaj kumlarındaki doğal
radyoaktivite çalışmaları, dışsal maruz kalınan gamma radyasyonuna bağlı riski
belirlemek için önemlidir.

Bu
çalışmada, Çeşme ilçesi kıyı şeridi boyunca alınan plaj kum örneklerinin doğal
radyonüklid (²²⁶Ra, ²³²Th, ⁴⁰K) aktivite
konsantrasyonları HPGe gamma spektrometresi sistemi ile ölçülmüş ve insanların
maruz kaldığı doz oranları hesaplanmıştır. Plaj kumlarının ²²⁶Ra, ²³²Th,
⁴⁰K aktivite konsantrasyonları sırasıyla, 5.70–38.83, 3.870–292.7 ve
120.4 – 377.6 Bq/kg aralığında olduğu ölçülmüş ve absorbe edilen gamma doz
hızıları 12-202 nGy/h aralığında olduğu hesaplanmıştır. Yıllık etkin doz
eşdeğer oranları 0.015-0.250 mSv aralığında olduğu bulunmuştur. Kum
örneklerinin radyum eşdeğer aktivite değerleri, dünya limit değeri olan 370
Bq/kg'dan düşük bulunmuştur, Çeşme-Alaçatı’daki bir plaj hariç. Elde edilen
sonuçlar, Çeşme kıyı şeridindeki radyoaktivite ve doz oranlarının nüfus açısından
herhangi bir risk oluşturmadığını göstermektedir.

Anahtar Kelimeler

Natural radioactivity, beach sand, dose rate, coastline, Çeşme

Kaynakça

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