The faculty member in the College of Science, University of Al-Mustansiriyah, Dr. Iman Tariq Al-Alawi and the researcher in the merged Ministry of Science and Technology, Dr. Osama Abd Al-Amir conducted a joint study on radiological characterization of the nuclear research reactor IRT-5000 (14-TAMMUZ) in the Tuwaitha Nuclear Research Center in Iraq. The joint study demonstrated collecting samples from the site and analyzing them, performing a comprehensive radiological characterization, assessing the risks which workers in the nuclear research reactor may expose to, using scanners to check the rates of external exposure dose and determining the quantity and quality of radionuclides depending on the Gamma spectrometry techniques. The joint study concluded that the concentration of radioactivity was from the isotope (Co-60), which most of the samples found in the reactor reservoir were contaminated with isotopes (Cs-137) and (Co-60) and (Eu-152). The joint study concluded developing of two visions based on the water level of the reactor tank and the necessity of making workers flowing the principle of “As Low As Reasonably Achievable " (ALARA) during all stages of dismantling the nuclear reactor in light of the recommendation of the International Atomic Energy Agency. It is worth mentioning that the joint study was published in the Journal of Environmental Earth Sciences in Scopus.