Nuclear medicine personnel exposed occupationally to ionizing radiation from radioisotopes during preparation, administration, and patients imaging. ICRP recommended that the main aim of radiation protection is about the protection of workers, trainees, and the public from radiation hazards. The effective dose or the equivalent dose must be assessed based on measurable or calculated quantities. The deep and shallow doses are used to evaluate the effective and equivalent dose to the person exposed to external radiation. Noting that Hp (0.07) is observed as equal to Hp (10) by the gamma-rays. The study aims to assess the radiation exposure incurred by undergraduate nuclear medicine technology students during the study period using an optically stimulated dosimeter. Materials and Methods: Radiation doses were monitored for 173 nuclear medicine technology students over four consequent years at Inaya Medical Colleges (Riyadh, KSA). Student dose equivalent was measured in terms of Hp (10) deep dose and shallow dose Hp (0.07), using calibrated optical stimulating-luminescent dosimeters (OSL), (Al2O3:C). These badges were read using an automatic OSL reader. Results; show that the mean deep dose OSL measurements were 0.844± 0.297, with a range from 0.24 to 1.4 mSv/y. As regards the shallow dose OSL measurements, the mean dose was (0.839 ± 0.297), the minimum reading was (0.24 mSv/y) and the maximum was (1.39 mSv/y).  Conclusion: All nuclear medicine technology students received radiation equivalent doses significantly lower than the ICRP dose limits during their training practice in their study period. The study denotes a safe training environment for students and proper understanding and application of safety procedures given to the students during their theoretical study courses.