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Adopting a recent calculation of the Galactic interstellar radiation field,we calculate the attenuation of the very high energy gamma rays from theGalactic sources. The infra-red radiation background near the Galactic Centeris very intense due to the new calculation and our result shows that a cutoffof high energy gamma ray spectrum begins at about 20 TeV and reaches about 10%for 50 TeV gamma rays.Comment: 6 pages, 1 figure, figure is changed, conclusion not change

Very high energy γ ray absorption by the galactic interstellar radiation field