Internal distribution of radiation absorption in an infinite semitransparent cylinder

 The internal distribution of spectral radiation absorption in an infinite semitransparent cylinder irradiated uniformly and isotropically is determined by the ray tracing method, and the detailed theory computation formulae for the internal spectral radiation absorption are deduced. The computed results show that the peak of internal volumetric spectral radiation absorption may locate at interior shell of the cylinder. The dimensionless volumetric spectral radiation absorption is higher near the center for weakly absorbing or small cylinders, but the dimensionless volumetric spectral radiation absorption is higher near the surface for strongly absorbing or large cylinders. Refraction focuses the rays close to the cylinder center, with the increases of the refractive index n, the dimensionless volumetric spectral radiation absorption increases near the cylinder center and decreases near the cylinder surface. Received on 9 February 2001