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Silicon Lithium-Drifted Detectors

Instrumentation. Traditional methods of alpha and beta spectrometry instrumentation have changed little over the past decade. Alpha spectrometric methods typically rely on semi-conductor or lithium-drifted silicon detectors (Si(Li)), or more historically gridded ion chambers, and these detection systems are still widely used in various types of uranium-series nuclide measurement for health, environmental, and... [Pg.30]

Lithium dichromate, molecular formula, properties, and uses, 6 562t Lithium diisopropylamide (LDA), 15 148 Lithium-drifted silicon [Si(Li)] detector, 26 434... [Pg.531]

Lithium-drifted silicon x-ray detectors designed to measure trace amounts of plutonium in soil samples have been fabricated by Walton et al. (1984). These diodes have been passivated with sputtered a-Si H, with a resulting lowering of leakage current at the operating low temperatures. [Pg.269]

The most frequently used silicon detector is a small pellet of lithium drifted silicon, some 6 mm in diameter and 3-4 mm thick. It is good only for X-rays, in the energy range between 4 and 50 keV. In fact, there are some standard sizes of Si(Li) detectors, areas of 30 and 100 mm are considered normal, anything else is a detector made by specifications of the user. [Pg.157]

The X-ray signal in STEM is usually collected by compact solid state detectors based on lithium-drifted silicon diodes. The X-ray photon is sorted by energy, henee the alternative names for X-ray fluorescence analysis Energy Dispersive X-ray Spectroseopy (EDS or EDX). The typical energy resolution for an X-ray photon is of on the order of 150 eV This is suffieient in most cases for resolving peaks of different elements, but is inadequate for deteeting... [Pg.57]

The x-ray fluorescence system consisted of a radioactive source as the excitor and a 200-ev resolution (FWHM) lithium-drifted silicon detector with standard electronics. Only 15 minutes were required to completely process a sample. [Pg.3]

The excellent resolution provided by the more recently developed lithium-drifted silicon [Si(Li)] and germanium [Ge(Li)] semiconductor detectors (see Chap. [Pg.393]

The most common semiconductor detector for laboratory EDXRF systems is the lithium-drifted silicon diode, represented as Si(Li). (It is called a silly detector for short). A schematic diagram of a silicon lithium-drifted detector is shown in Fig. 8.30. A cylindrical piece of pure, single crystal silicon is used. The size of this piece is... [Pg.569]

The detectors used in the various forms of EDXRF are semiconductor detectors Conventionally, two types, i. e. lithium drifted silicon (Si(Li)) and hyperpure germa nium (HP-Ge) detectors are used. Their main advantages are their compact size the non-moving system components, and relatively good energy resolution which optimally is of the order of 120 eV at 5.9 keV. Because of their operation prin... [Pg.386]

Semiconductor technology is still a rapidly developing field that has seen the introduction of new detector types in recent years. However, the standard detector type on which ED-XRF technology was founded is the lithium-drifted silicon detector, Si(Li). This is the detector type against which the performance of new types of semiconductor detector is evaluated. [Pg.5198]

Semiconductor transducers have assumed major importance as detectors of X-radiation. These devices are sometimes called lithium-drifted silicon detectors, Si(Li), or lithium-drifted germanium detectors, Ge(Li). [Pg.166]

Lithium atoms are highly mobile at room temperature. Thus lithium-drifted silicon (Si [Li]) detectors tend to undrift... [Pg.35]


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See also in sourсe #XX -- [ Pg.41 ]




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