1 Radiation monitoring for the cyclotron area using TLD-100 for the cyclotron CS30 at KFSH&RC A. A. Alharbi 1* , A. Algaith 2 , S. Mellibary 2 , S. Rahma 2 and A. Azzam 1,3 1 Faculty of Sciences, Princess Nora Bint Abdulrahman University, Riyadh, Saudi Arabia. 2 King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia. 3 Nuclear Physics Department, Nuclear Research Center, AEA, Cairo Egypt. Abstract The occupational radiation doses in the cyclotron CS30 in (KFSH&RC), which is a single energy cyclotron commonly used for medical radioisotopes production, were measured during the routine production for some medical radioisotopes (Gallium-67, Krypton-81m, Iodine-123 and Thallium-201). A set of 136 (TLD-100) LiF:Mg,Ti dosimeteric cards and a Harshow 3500 TLD card reader were used for the dose measurements in the various locations in the cyclotron room as well as the working area. A radiation area mapping were plotted and discussed for the different irradiation conditions. The result for those measurements shows that the measured occupational dose in the working area was about 2.9 ms.yr -1 which is far below the maximum permissible dose for the workers. Key words: CS30 cyclotron (KFSH&RC) / LiF:Mg,Ti (TLD-100) / Occupational radiation doses / TLD dosimeters / Radiation measurements. * Corresponding author: 600 University Oaks Blvd, apt:N211, College Station, Tx,77840, USA, cell phone:+1-979-422-6999; fax: +1-979-845-1899; e-mail: abeer.alharby@gmail.com