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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.
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.
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.
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 ...
Spot prices of germanium ingot have jumped nearly a third in the past month to an all-time high of 13,250 yuan ($1,826.48) a kilogram (kg) on Wednesday, data from information pr.
A clover detector is a gamma-ray detector that consists of 4 coaxial N-type high purity germanium (Ge) crystals each machined to shape and mounted in a common cryostat to form a structure resembling a four-leaf clover. [1] The clover is the first composite Ge detector.
The crystal detector was the most successful of many detector devices invented during this era. The crystal detector evolved from an earlier device, [40] the first primitive radio wave detector, called a coherer, developed in 1890 by Édouard Branly and used in the first radio receivers in 1894–96 by Marconi and Oliver Lodge.