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An important application of caesium iodide crystals, which are scintillators, is electromagnetic calorimetry in experimental particle physics.Pure CsI is a fast and dense scintillating material with relatively low light yield that increases significantly with cooling, [11] and a fairly small Molière radius is 3.5 cm.
The scintillator consists of a transparent crystal, usually a phosphor, plastic (usually containing anthracene) or organic liquid (see liquid scintillation counting) that fluoresces when struck by ionizing radiation. Cesium iodide (CsI) in crystalline form is used as the scintillator for the detection of protons and alpha particles.
The light yield and energy resolution of the scintillator (6.6% for 137 Cs) is comparable with that of CdWO 4. [53] CsI: undoped cesium iodide emits predominantly at 315 nm, is only slightly hygroscopic, and has a very short decay time (16 ns), making it suitable for fast timing applications. The light output is quite low at room temperature ...
Indirect detectors contain a layer of scintillator material, typically either gadolinium oxysulfide or cesium iodide, which converts the x-rays into light.Directly behind the scintillator layer is an amorphous silicon detector array manufactured using a process very similar to that used to make LCD televisions and computer monitors.
Handheld and many laboratory gamma spectrometers are therefore the scintillator kind, mostly with thallium-doped sodium iodide, thallium-doped caesium iodide, or, more recently, cerium doped lanthanum bromide. Spectrometers for space missions conversely tend to be of the germanium kind.
The detectors were backed by, (e) a large caesium iodide (CsI) scintillation counter which was viewed by four light-sensitive diodes. The geometric factor was as large as 35 cm2-sr. The two position-sensitive counters enabled computation of the exact length of the trajectory along the ionization chamber.
The latter then rapidly de-excite by emitting scintillation light (fast component). In case of inorganic scintillators, the activator impurities are typically chosen so that the emitted light is in the visible range or near-UV where photomultipliers are effective. The holes associated with electrons in the conduction band are independent from ...
A telescope, consisting of three aligned detectors -- (A) solid state, (B) plastic scintillator, and (C) Caesium iodide (CsI) scintillator—and a plastic scintillator anticoincidence shield (D), were used to measure protons from 0.8 to 7.0 MeV—counts in (A) but not in (B) -- and from 35 to 110 MeV—coincident counts in (B), measuring dE/dx ...
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