초록

The invention is a stationary radiation detection tool that provides an azimuthal indication of the location of subterranean radiation sources. In one embodiment, the tool has four gamma ray sondes, each of which receives gamma rays from a discrete sector of surrounding formation.

대표청구항 ▼

[ What is claimed is:] [1.]1. A gamma ray tool mounted in drill string disposed in a well bore through a formation, comprising:a pressure barrel secured in a non-rotating portion of the drill string; anda plurality of gamma ray sondes disposed within said pressure barrel, each of said sondes includi

[ What is claimed is:] [1.]1. A gamma ray tool mounted in drill string disposed in a well bore through a formation, comprising:a pressure barrel secured in a non-rotating portion of the drill string; anda plurality of gamma ray sondes disposed within said pressure barrel, each of said sondes including a scintillation crystal disposed within a gamma ray shield, said shield shielding said scintillation crystal from incident gamma radiation except from a discrete azimuthally limited sector of formation relative to the longitudinal axis of the drill string, said sondes collectively cooperating to detect gamma rays from all azimuthal locations about the longitudinal axis of the drill string.