Natural radioactivity in rock samples of Aravali hills in India

Background: natural radionuclides in rock samples,primarily 238u (uranium),232th (thorium) and 40k (potassium),are the main source of radia on exposure to workers and general public and their measurement is of paramount importance from radia on protec on point of view. materials and methods: gamma spectrometry using hpge detector was used to measure the radioac vity and assess the radiological hazards and annual effec ve dose. the data is sta s cally significant. results: in the studied rock samples,the mean ac vity of 238u,232th,40k is 12.15 ± 1.68 bq/kg,45.17 ± 6.92 bq/kg and 639.24 ± 115.86 bq/kg,respec vely. the mean values of radium equivalent ac vity,radiological hazards external hazard index (hex),internal hazard index (hin),gamma index (iγ) and alpha index (iα) are 125.96 ± 14.94 bq/kg,0.34 ± 0.04,0.37 ± 0.04,0.48 ± 0.06 and 0.06 ± 0.00 respec vely. the mean values of absorbed dose rate,indoor and outdoor annual effec ve dose of gamma radia on are 59.55 ± 7.16 ngy/h,0.29 ± 0.04 msv and 0.07 ± 0.00 respec vely. a strong posi ve correla on was observed between the radium equivalent ac vity and the absorbed dose (correla on coefficient r2 = 0.99). conclusion: the present inves ga ons showed that the inborn radioac vity is within the world and indian average value. and the findings indicate that the studied samples do not pose any significant radia on hazard to the public in large and the workers in par cular and when used as construc on material also.