assessment of terrestrial gamma radiation dose and associated radiological hazards in Katsina State, Nigeria.

Terrestrial gamma radiation dose (TGRD) rates were measured from different locations in Katsina State, Nigeria, using a portable radiation survey metre based on geological formations and soil types. The measured TGRD rates ranged from 45 to 271 nGyh with an average value of 116 ± 1 nGyh. Geological formation (silicified sheared rock) and soil type (lithosols and ferruginous crusts and ferruginous tropical soils) appeared to have the highest mean TGRD values of 163 and 134 nGyh with sandstone geological formation and alluvial and hydromorphic soils having the lowest TGRD with values of 80 and 61 nGyh, respectively.