Patent ID: 9261610
Filing Date: 2016-02-16
CPC Classification: G01T

Claim Text:
1. An HPGe detector, comprising: an HPGe single crystal having an intrinsic region exposed surface; a first electrode and a second electrode connected to a first contact electrode and a second contact electrode of the HPGe single crystal respectively; and a conductive guard ring arranged in the intrinsic region exposed surface around the first electrode to separate the intrinsic region exposed surface into an inner region and an outer region, wherein the HPGe single crystal is a coaxial type detector or a point electrode type detector, and the intrinsic region exposed surface is an end face of the HPGe single crystal, the first electrode being connected to the first contact electrode at a central hole or a central point of the end face, the second electrode being connected to an outer circumferential surface of the HPGe crystal, and the conductive guard ring being close to the first electrode and electrically insulated from the first electrode, and wherein a ratio of radius of the conductive guard ring to that of the guarded end face is less than or equal to 1/3.