The aim of  present paper to find the contamination  selected area in Salahdin governorate where the radon gas concentration elevated and they are :Al-Qadasaia quarter ,Hamad Shahab village (communication center in past),Al-douloyea town –Youths center, Dijala town ,samara city (in house garden) and finally in Beji city (communication tower) .In this study ,we had employed the trace detector of CR-39, the obtained results shows the radon concentration exceeds the permissible limits which issues by ICRP which is about 200 – 800 Bq/m3  while the concentration in Salah din governorate  is - which refers to the high ratio of depleted  Uranium all over the gubernator