A radiation detector has an aperture of area Ad = 10-6 m2 and is positioned at a distance of r = 1 m from a surface of area A, = 10-4 m2. The angle formed by the normal to the detector and the surface normal is ? = 30°. The surface is at 500 K and is opaque, diffuse, and gray with an emissivity of 0.7. If the surface irradiation is 1500 W/m2, what is the rate at which the detector intercepts radiation from the surface?

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