For decommissioning of the medical linear accelerator facilities, thethermalneutron dose in three hospitals equipped with 10 MV medical linear accelerator was determined by activation of gold foil and CR-39. It was found that the maximum neutron fluence rate at the surface of inside wall was 7.6 ×106±1.8×106cm2d-1 (mean±standard deviation). 196Au was not detected . These results indicate that the quantity of the radio-activation nuclides generated in the concrete will not exceed the clearance level of IAEA RS-G-1.7.
