Fallout levels of
137Cs in surface soil from North WesternLibya have been measured using gamma-ray spectrometry. The activity concentrationsof
137Cs in soil ranged from 975 to 1720 mBq . kg
—1 . The areal activity concentrations ranged from 1300 to 2250 mBq .m
—2 , and were higly correlated with annual precipitation.The effective dose from external exposure to
137Cs is found tobe 3 nSv . y
—1 .