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Measurement of Outdoor and Indoor Natural Gamma Background Radiation and Cancer Risk Assessment in Residents of kashan
Masoud Jafarpour Seyed , Habibollah Moradi , Akbar Aliasgharzade , Mehran Mohseni *
, mehran.m1352@yahoo.com
Abstract:   (10 Views)
Background: Natural gamma background radiation can cause ionization in vital molecules such as DNA and destructive effects on human health. Measurement of this natural radiation is very important because they increase incidence of cancers and genetic damages. The aim of this study was to measure the natural gamma background radiation dose rate and the annual effective dose and cancer risk assessment in Kashan city, north of Isfahan province.   
Materials and Methods: The study was done cross-sectional. The measurements were performed using the dosimeter of the Radiation Alert Monitor5 model with the detection accuracy of 10 nSv/h during daylight in outdoor and indoor in five geographical regions of Kashan city (north, south, east, west and center) and in four different seasons of the year. In each geographic region, measurements were carried out at ten random points and during three consecutive days. Also, the annual effective dose and lifetime risk of cancer were calculated.   
Results: The mean dose rates were 155±34 nSv/h and 186±34 nSv/h in outdoor and indoor, respectively. There was no significant difference between the mean dose rate in different seasons and different geographical regions. Furthermore, the annual effective dose was found to be 1.10 mSv while the estimated lifetime risk of cancer was 0.0458%.
Conclusion: The annual effective dose arising from natural gamma background radiation in kashan city (1.10 mSv) is much higher compared to the global average value (0.48 mSv) and the values obtained in most cities in Iran.
 
Keywords: Background Radiation, Iran, Radiation Effects, Gamma Rays, Neoplasms, Radiation-Induced
     
Type of Study: Research | Subject: medicine, paraclinic
Received: 2018/04/3 | Accepted: 2018/08/21
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