Terrestrial gamma dose rate, radioactivity and radiological hazards in the rocks of an elevated radiation background in Juban District, Ad Dali' Governorate, Yemen

This study aims to evaluate natural radiation and radioactivity in the rock and to assess the corresponding health risk in a region of elevated background radiation in Juban District, Ad Dali' Governorate, Yemen. The mean external gamma dose rate was 374 nGy h(-1) which is approximately six times the world average. The measured results were used to compute annual effective dose equivalent, collective effective dose and excess lifetime cancer risk, which are 2.298 mSv, 61.95 man Sv y(-1) and 8.043 x 10(-3), respectively. Rocks samples from different geological formations were analyzed for quantitative determination of 226Ra, 232Th and 40K. The specific activity of the rocks samples ranges from 7 +/- 1 Bq Kg(-1) to 12 513 +/- 329 Bq Kg(-1) for 232Th, from 6 +/- 1 Bq kg(-1) to 3089 +/- 74 Bq kg(-1) for 226Ra and 702 +/- 69 Bq kg(-1) to 2954 +/- 285 Bq kg(-1) for 40K. 232Th is the main contributor to gamma dose rate from the rock samples. Indicators of radiological health impact, radium equivalent activity and external hazard index are 3738 Bq kg(-1) and 10.10, respectively. The mean external hazard index was ten times unity in the studied locations in Juban District, which is higher than the recommended value.