Spatial distribution of gamma-capture radiation in a borehole

The solution of the problem on the space distribution of capture gamma radiation induced by a point source of fast neutrons in an infinite homogeneous medium pierced by a borehole is considered. In solving the problem, use is made of the diffusion approximation of the theory of transport of neutron and gamma radiation in a borehole and in rock. The results of the numerical calculation are utilized for analyzing the principal regularities in the space distribution of the capture gamma radiation in the borehole