Abstract

• In this present study, the natural radioactivity levels of sediments from Meiktila Lake, Meiktila Township, Mandalay Region have been investigated by using HPGe detector and analysed with the Gamma Vision-32 The radium equivalent activity, the absorbed dose rate and external hazard in each sample was calculated to assess the radiation hazard for people. All sample have shown radium equivalent activity ranged from 157.30Bq kg-1 to 181.80Bq kg-1 . The observed values of radium equivalent activity for all samples were less than the permissible limits of 370 Bq kg-1 . The values of calculated absorbed dose rates in the samples under investigated are ranged from 97.10 nGyhr-1 to 112.26 nGhr-1 . The value of absorbed dose rate for all samples were higher than the average global terrestrial radiation of 55 nGhr-1 . But the calculated values of external hazard index values for all samples were less than the permissible value 1.0 mSvy-1 .