This research studies radon gas concentration in (24) samples in all buildings of Samarra University (old and new) using long-term measurement technique using the nuclear effect detector (CR-39) to record the effects of alpha particles emitted from radon included with the results. The results showed a variation in the radon concentration values, so it was the highest value in the buildings of the physics department's laboratories, specifically in the nuclear laboratory, it reached (175.9 Bq / m3), followed by in this value the Computer and Information Center if its value was (169.5 Bq / m3), but the lowest value was in a laboratory The English language sounds if it reaches (3.8 Bq / m3), compared to the background radiation of (39.3 Bq / m3). All the results that were obtained were within the internationally permitted limits, and there is no danger to the university staff, including employees and students, and also the fact that the university is newly formed, this quality gave it an advantage in not being exposed to a high level of radiation or environmental pollution.

Presence of Uranium, Calculation of Radon, Nuclear Track Detector.