Assessment of radiation safety of a 4 MV Industrial Accelerator Facility using a TLD Based Passive Area Monitor

Radiation levels around radiography enclosures where objects to be radiographed are carried into the radiography room by a conveyor belt system moving through a hatch provided at the entrance door, have been of significant concern to plant operators present in the immediate vicinity of the installation. Personal involved in the loading-unloading of jobs on the conveyor belt system and other operators of the plant remain stationed at these locations. Our present study is aimed at estimation of radiation levels at various locations in the immediate vicinity of a 4 MV industrial linear accelerator installation using passive area monitors based on CaSO4: Dy, Teflon TLD disc. The radiation levels measured using (i) passive area monitor and (ii) a portable dose rate meter, were found to be significantly lower than the values calculated for the various locations in the accelerator room. (author)