A DETECTOR FOR RADIATION, PARTICULARLY HIGH ENERGY ELECTROMAGNETIC RADIATION

摘要

The invention refers to a detector for radiation, particularly high energy electromagnetic radiation. The detector comprises a converting section including a cathode (3) for converting the radiation (P) incident on the converting section in electrons (E) by the photoelectric effect. The detector further includes a gas electron multiplier (4) for generating an electron avalanche from electrons (E) which are generated by the converting section and enter the gas electron multiplier (4), the gas electron multiplier (4) comprising a first electrode (5), a dielectric layer (6) and a second electrode (7), the first electrode (6) being disposed at a first side of the dielectric layer (6) adjacent to the converting section and the second electrode (7) being disposed at a second side of the dielectric layer (6) opposite to the first side. The gas electron multiplier (4) comprises a number of holes (9) filled with gas, said holes (9) extending through the first electrode (5), the dielectric layer (6) and the second electrode (7). Moreover, the detector includes a detector anode (8) adjacent to the second electrode (7) for detecting the electron avalanche. The detector according to the invention is characterized in that the detector anode (8) extends at each hole (9) of the gas electron multiplier (4) from the second electrode (7) over the hole (9) such that the hole (9) is covered at one side completely by the detector anode (8).