Patent ID: 7105829

Claim:
A radiation detector having a radiation sensitive semiconductor for generating electric charges upon incidence of radiation, and a common electrode for bias voltage application formed two-dimensionally on a front surface of the radiation sensitive semiconductor, a lead wire for bias voltage supply being connected to a surface of the common electrode, said detector comprising: an electrically insulating buffer seat disposed on the front surface of the radiation sensitive semiconductor, in a position outside a radiation detection effective area; said common electrode for bias voltage application covering at least a portion of the buffer seat, wherein said lead wire for bias voltage supply is connected to a surface portion of the common electrode located on the buffer seat, wherein said buffer seat has a height in a range of 0.2 to 2 mm, and includes a downwardly sloped seat portion formed around a side wall thereof and having a thickness gradually decreasing outwardly away from the buffer seat, said common electrode extending from the radiation detection effective area to a top of the buffer seat, following a surface of the sloped seat portion, and wherein said buffer seat is formed of a hard resin material, and said sloped seat portion is formed of a soft polymeric material of silicone resin or synthetic rubber base.