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From Constellation Technology
The development of mercuric iodide (HgI2) as a solid state radiation detector material is motivated by the need for compact spectrometer grade detectors, which operate at ambient temperatures. Among candidates for solid state detectors, mercuric iodide possesses the highest intrinsic resistivity with values ranging from 1012 to 1013 Ohm.cm. It can therefore sustain high bias voltages while still generating low leakage currents. In addition, the large atomic numbers of the constituent elements of mercuric iodide (mercury Z=80 and iodine Z=53) in conjunction with a high density of 6.3 g/cm3 result in a high efficiency for the absorption of higher energy radiation and a potentially high full-energy peak efficiency. The synthesis and purification processes used in our laboratory result in high purity material from which large (500g) single crystals with high structural quality can be grown using a physical vapor transport method. This makes it possible to fabricate planar detectors with active areas of 6.25 cm2 and thicknesses up to 3mm or more. Products & Services
Scintillation counters are used to detect gamma, x-ray and neutron radiation. They consist of a detector for sensing incident radiation and a photomultiplier for producing countable pulses.
Radiation detectors are used for medical diagnoses, radioactive dating measurements, and measurements of background radiation, activity levels and radiation doses.
Disposable primary batteries are replaced once the energy supply is depleted. Their energy is produced when the materials within the battery react and are exhausted.
High performance liquid chromatograph (HPLC) detectors pass a beam of light through a column effluent as the fluid passes through a low-volume flow cell. Variations in light intensity are recorded and a chromatograph is generated.
Optical crystals are transparent in different spectral regions, depending upon the crystal material.
Product Announcements
Topics of Interest
Thick mercuric iodide (HgI2) detectors are investigated as potential room temperature gamma-ray spectrometers. By using pixelated anodes the induced charge on the electrode is dependent mainly on...
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Radiation and Particle Detectors
Superconducting radiation and particle detectors measure the energy deposited by photons or particles that interact with the detector. Superconducting detectors...
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Scintillation dectectors use a solid or liquid material whose atoms are easily excited by the incoming radiation. These excited atoms emit visible light when they return to their ground state. Common...
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3.2 Inorganic Pigments
In contrast to the thermochromic effect of organic composites, thermochromism of inorganic materials, such as metal salts and metal oxides, has been well known for a long time...
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Alberto Del Guerra,
Department of Physics, University of Pisa and INFN, Sezione di Pisa
Pisa, Italy
(e-mail: alberto.delguerra@djunipi.it)
1.1 Medical Imaging
The enormous development...
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