journal of kerbala university

A measure had been of radioactivity for samples of the underground water by use the germanium detector of high purity (HPGe). Sample of underground water were collected in different region of Babylon governorate relying on the administrative map of the governorate . twenty samples of the underground water were collected for two stage where ten samples were collected in 1st step therefore determined radioactivity regions & relying on that the ten samples were collected of 2nd stage. A measure prove found natural radioactivity for some samples of underground water for different regions of Babylon governorate with found some isotopes of Uranium-238 decay series (Radium-226,Lead-214&Bismuth-214) , And the presence of Lead-212 isotope which belongs to Thorium-232 series in one sample. The concentration of the Radium-226 was found under the sensitivity level & 16.4±8.6 Bq/L in Al-Kifl region whereas the concentration of Bismuth-214 & Lead-214 have range between the sensitivity level & 6.72±2.4 & 9.8±2.1 Bq/L respectively in Al-Kifl & Al-Kasim regions . Lead-212 isotope has the concentration of 3.2±1.1 Bq/L in one sample only in Al-Kifl region. All obtained results referred to the fact that all the concentration were within the allowed limits to agricultural & domestic use at comparing the results in this work with those published by international atomic energy agency & universal researches.