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The radioactivity of radon gas in five samples of drinking water that manufactured in different regions of Najaf city have been measured by RAD7 detector. The results show that, radon concentrations were varied from (0.33) Bq/l to (1.2) Bq/l. This study, prove that the high value of radon concentrations was less than the allowed limit which it is equal (11.1) Bq/l.

RADON CONCENTRATIONS IN DRINKING WATER SAMPLES FOR SOME AREA AT AL-NAJAF CITY