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- 93687d67-fcb3-48bf-b37f-ff6722a1687f definition "Germanium Semiconductor Detector (GSD) are semiconductor diodes having a P-I-N structure in which the Intrinsic (I) region is sensitive to ionizing radiation, particularly X-rays and gamma rays. Under reverse bias, an electric field extends across the intrinsic or depleted region. When photons interact with the material within the depleted volume of a detector, charge carriers (holes and electrons) are produced and are swept by the electric field to the P and N electrodes. This charge, which is in proportion to the energy deposited in the detector by the incoming photon, is converted into a voltage pulse by an integral charge sensitive preamplifier. Because germanium has a relatively low band gap, these detectors must be cooled in order to reduce the thermal generation of charge carriers (thus reverse leakage current) to an acceptable level. Otherwise, leakage current induced noise destroys the energy resolution of the detector. Liquid nitrogen, which has a temperature of 77?K is the common cooling medium for such detectors. The detector is mounted in a vacuum chamber which is attached to or inserted into an LN2 dewar or an electrically powered cooler. The sensitive detector surfaces are thus protected from moisture and condensable contaminants. [Source: CANBERRA 'http://www.canberra.com']" @default.
- 93687d67-fcb3-48bf-b37f-ff6722a1687f id "1655130" @default.
- 93687d67-fcb3-48bf-b37f-ff6722a1687f path_id 4f81c61c-f100-4bc4-9664-d9b70d2f162f @default.
- 93687d67-fcb3-48bf-b37f-ff6722a1687f path_id 6015ef7b-f3bd-49e1-9193-cc23db566b69 @default.
- 93687d67-fcb3-48bf-b37f-ff6722a1687f path_id 72227178-bb4c-4ff5-98a3-f976aa3f3714 @default.
- 93687d67-fcb3-48bf-b37f-ff6722a1687f path_id b2140059-b3ca-415c-b0a7-3e142783ffe8 @default.
- 93687d67-fcb3-48bf-b37f-ff6722a1687f path_label "Earth Remote Sensing Instruments" @default.
- 93687d67-fcb3-48bf-b37f-ff6722a1687f path_label "Instruments" @default.
- 93687d67-fcb3-48bf-b37f-ff6722a1687f path_label "Passive Remote Sensing" @default.
- 93687d67-fcb3-48bf-b37f-ff6722a1687f path_label "Photon/Optical Detectors" @default.
- 93687d67-fcb3-48bf-b37f-ff6722a1687f prefLabel "GSD" @default.
- 93687d67-fcb3-48bf-b37f-ff6722a1687f reference "" @default.
- 93687d67-fcb3-48bf-b37f-ff6722a1687f tag "Instruments" @default.