ملخص الدراسة:

Level of radon concentration has been performed in south of Iraq's oil fields, at 72 well. Apassive integrating radon discriminative monitor was used in this study. Both LR-115 type II and CR-39 plastic track detectors have been used for the measurement of radon concentration in the Crude oilsamples. The investigation show great variability of radon concentration in each well. The highestvalue of radon concentration was observed in oil well number (119) in Al-Hammar field 993.4 Bq.m-3 ,while the lowest value observed in oil well number (76) in Al-Rafidhya field 195.9 Bq.m-3 .Thisvariation in concentration of radon in the well have been discussed in this study.