[en] The aim of this study is to evaluate and analyze the on position leakage in-patient plane and radiation safety compliance of telegamma unit over the period of 36-months. RMM (Roentgen per minute at 1 meter) measurements and leakage radiation measurements in-patient plane are the part of the Quality assurance programme. Both measurements were repeated at regular intervals. These recorded values have been taken up to assess the shielding adequacy of source housing of telecobalt unit over the period of years. Measured values at 69.0 cm and 156.0 cm from the beam axis 8 points located in-patient plane ranges from 0.027% to 0.081% and 0.0045% to 0.0062% respectively, which were well below the specified tolerance limit of 0.1% RMM