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The clover is the first composite Ge detector. It remains widely used in the detectors of particle accelerators, where multiple clover modules form an array all around the target to capture the rays. More complex composite detectors, such as the 7-element hexagonal cluster detector used on the Euroball, offer even better data. [2]
All materials close to the detectors are screened for radiopurity. A dilution refrigerator is used to cool the detectors, built in the opposite orientation to most instruments with the detectors at the top and the refrigeration mechanism below. EDELWEISS uses high purity germanium cryogenic bolometers cooled to 20 milliKelvin above absolute zero.
While silicon detectors cannot be thicker than a few millimeters, germanium can have a sensitive layer (depletion region) thickness of centimeters, and therefore can be used as a total absorption detector for gamma rays up to a few MeV. These detectors are also called high-purity germanium detectors (HPGe) or hyperpure germanium detectors.
Schematic representation of the electric segmentation of an AGATA detector. The parameters of the detectors are: [1] Maximum cylinder size: 90.0 mm length, 40.0 mm radius. Coaxial hole size: 10.0 mm diameter, extension to 13.0 mm from the front face. Passivation layers: 1.0 mm at the back of the detector, 0.6 mm around the coaxial hole.
Relative efficiency values are often used for germanium detectors, and compare the efficiency of the detector at 1332 keV to that of a 3 in × 3 in NaI detector (i.e., 1.2×10 −3 cps/Bq at 25 cm). Relative efficiency values greater than one hundred percent can therefore be encountered when working with very large germanium detectors.
Along with its cooler, it measures 468 by 534 by 604 mm (18.4 by 21.0 by 23.8 in). The detector is a photodiode made of a 1.2 kg germanium crystal, reverse biased to about 3 kilovolts, mounted at the end of a six-meter boom to minimize interferences from the gamma radiation produced by the spacecraft itself.
GEODM (GErmanium Observatory for Dark Matter), with roughly 1500 kg of detector mass, has expressed interest in the SNOLAB "Cryopit" location. [ 20 ] Increasing the detector mass only makes the detector more sensitive if the unwanted background detections do not increase as well, thus each generation must be cleaner and better shielded than the ...
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