Terrestrial gamma radiation dose rates and radiological mapping of Terengganu state, Malaysia

Measurement of terrestrial gamma radiation dose (TGRD) rates in Terengganu state, Malaysia was carried out from 145 different locations using NaI[Tl] micro roentgen survey meter. The measured TGRD rates ranged from 35 to 340 nGy h-1 with mean value of 150 nGy h-1. The annual effective dose to population was found to be 0.92 mSv y-1. The data obtained were used in constructing the gamma isodose map using ArcGis 9.3 which shows the distribution of TGRD rates across the state