Introduction: It is important to measure background radiation, because human beings are always exposed to environmental radiation. These ionizing radiations leave energy when striking human body and this energy when imparted is harmful for body tissues. In this study, environmental gamma radiation (outdoor measurements) of Kerman towns and indoor gamma dose rate in Kerman by thermoluminescent dosimeter (TLD) and RDS-110 surveymeter were measured.
Methods: Equipments used in this study Experimental include: 1. A survey meter (RDS-110). 2. TLD-100 H (Lif:Mg,Cu,P) dosimeters. 3. TLD-Reader 3500 made by Harshaw, USA.
In order to determine outdoor dose rate, four stations along with four main geographical directions and one station in town centers were selected. Indoor measurements in Kerman were carried out inside 20 dwellings by both TLD and RDS-110.
Results: Our results indicate that on average, Bardsir has the highest outdoor background radiation in the province (1.03±0.32mSv/y) and Kahnooj has the lowest outdoor background radiation (0.61±0.30mSv/y).
The average indoor dose rate measured by TLD and RDS-110 in Kerman dwellings were not equal and the difference of averages is equal to 12%.
Conclusion: According to the above results, the annual dose rate of Kerman, Zarand, Baft, Shahrbabak, Sirjan, Bardsir, Rafsanjan, Bam and Jiroft are higher than the corresponding values for a normal area.