The Annual Change of Environmental Gamma Radiation in Bitlis

In this study, the environmental gamma radiation starting at December, 2014 through November, 2015 were measured at different 16 points . The environmental gamma radiation measurement was made from the ground and one meter above the surface by using portable gamma survey meter which consisted of NaI(Tl) scintillation detector. The lowest values of environmental gamma radiation are 0.041 µSv/h at ground level and 0.035 µSv/h at the one-meter level on the location XIII, the highest values of environmental gamma radiation are 0.478 µSv/h at the ground level and 0.453 µSv/h at the one-meter level on the location XVI.