Utilization Efficient of ⁶⁰Co γ-ray Source

Four kinds of irradiation source arranging styles and three operating modes of ⁶⁰Co γ-ray sources were studied. The effects of these ways during radiation processing on γ-ray utilization rate were compared and analyzed by the calculation method of ⁶⁰Co γ-ray dosage rate. The results show that for these three operating modes, the γ-ray utilization rate of changing layer operation is the highest with 1.78, the partition operation is the second highest with 1.45, and the mode of irradiation source coverage and unchanging layer operation is the least with 0.85. During the implementation of changing layer operation, when the height of the basket within 1.2 m the γ-ray utilization rate of centralized arrangement (0.6∶1.8∶0.6) is the highest with 1.60. When the height of the basket is 1.4 m the γ-ray utilization rate of mild centralized arrangement (0.9∶1.2∶0.9) is the highest with 1.72. When the height of the basket is up to 1.6 m, the γ-ray utilization rate of the average arrangement is the highest up to 1.78.