[en] The national centre for radiation research and technology (NCRRT) is carrying scientific research and technological Activities related to ionizing radiations. About 800 workers are now working in the plant and about 10% of them are working usually in the so-called radiation controlled and supervised areas radiation levels around the irradiation facilities as well as the annual occupational radiation doses during 1985-1989 are reported. The mean annual collective dose is 0.13 man-sievert. The highly exposed group recorded an individual average annual dose of about 3.1 mSv, with the maximum individual annual dose of 7.7 mSv. About 90% of the radiation workers are dosed below 5 mSv/y. The mortality risk is calculated and compared with other industries