Ads
related to: scintillation detector systems
Search results
Results from the WOW.Com Content Network
A scintillator such as zinc sulphide is used for alpha particle detection, whilst plastic scintillators are used for beta detection. The resultant scintillation energies can be discriminated so that alpha and beta counts can be measured separately with the same detector, [8] This technique is used in both hand-held and fixed monitoring ...
A scintillation detector or scintillation counter is obtained when a scintillator is coupled to an electronic light sensor such as a photomultiplier tube (PMT), photodiode, or silicon photomultiplier. PMTs absorb the light emitted by the scintillator and re-emit it in the form of electrons via the photoelectric effect. The subsequent ...
Liquid scintillation counter. Samples are dissolved or suspended in a "cocktail" containing a solvent (historically aromatic organics such as xylene or toluene, but more recently less hazardous solvents are used), typically some form of a surfactant, and "fluors" or scintillators which produce the light measured by the detector.
The advent of the sodium-iodide scintillator [6] in 1948 and other detectors to follow became useful for spectroscopy. The photon detector and the Multichannel Pulse-Height Analyzer (MCA) [17] become the primary tools needed to produce a pulse-height spectrum of one or more radionuclides. It is first necessary to derive a digital number that is ...
LUX is developing similar systems that have set improved limits. Signal from ZEPLIN-III two-phase xenon detector. The fast scintillation pulse (S1) is generated promptly by scintillation in the liquid; a larger, delayed pulse (S2) is obtained once the ionisation drifted from the interaction site is emitted into the thin gas phase above the liquid.
Some detector designs can measure and separately identify all energies simultaneously. A phoswich [ 1 ] (" phosphor sandwich") is a combination of scintillators with dissimilar pulse shape characteristics optically coupled to each other and to a common PMT (or PMTs).
However the overall detector efficiency is largely affected by attenuation due to the window or tube body through which particles have to pass. In the case of gamma photons the detection efficiency is more dependent upon the fill gas and gamma energy. Low energy photons will interact more with the fill gas than high energy photons.
Charge coupled device (CCD) cameras were first applied to transmission electron microscopy in the 1980s and later became widespread. [3] [4] For use in a TEM, CCDs are typically coupled with a scintillator such as single crystal Yttrium aluminium garnet (YAG) in which electrons from the electron beam are converted to photons, which are then transferred to the sensor of the CCD via a fiber ...
Ads
related to: scintillation detector systems