CsI(Tl) Scintillator Crystals (Low After Glow)

High light yield
Rugged and robust, durable against thermal and mechanical shock
A low afterglow version (the value could be tailored upon request)
Applications: Nuclear Radiation Detection, Security and Industrial Inspection, Medical CT, etc.
CsI(Tl) Bulk Crystals, CsI(Tl) Scintillation Screens, and CsI(Tl) Scintillator Arrays are available

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Basic Properties:

Density(g/cm3)	4.51	Melting Point (K)	894
Cleavage Plane	None	Hardness(Mohs)	2
Hygroscopic	Slightly	Refractive Index at Emission Peak	1.79
Emission Peak Wavelength (nm)	550	Lower Wavelength Cutoff (nm)	320
Decay Time (ns)	1000	Light Yield (% of NaI(Tl) )	40
Afterglow(%@20ms)	0.05~0.39

Thallium-activated Cesium Iodide or CsI(Tl) crystals are among the brightest scintillator materials. Its emission peak sits at 550nm within the broad emission spectrum of 350-700nm, which nicely matches with photodiode readout components. Of the essential part, it generates a light yield four times higher than that of BGO, exhibiting an unrivaled brightness of 54 photons/Kev. CsI(Tl) is well suited for detecting particles that pack massive charges because its decay time is variant to the ionization capacity of a particle. It is possible to shrink the dimension of the detector without a high-voltage power source and implement a magnetic field when a scintillator-photodiode pair is allowed. Furthermore, CsI (Tl) has, in nature, a larger cross-section of the gamma-radiation photoabsorption.

It is robust and has excellent mechanical properties because it has no cleavage plane, contributing to its reliable strength under various conditions. CsI(Tl) can be utilized in medical applications such as jaw and head scanning, security X-radiation inspection, well-logging, space research, etc. CsI (Tl) is also immune to thermal and mechanical shock. However, it is worth noting that CsI(Tl) is a slow scintillator, which limits its counting rate.

Afterglow is defined as the fraction of scintillation light still present for a specific time after the excitation stops. In almost all occasions, afterglow is undesirable. For example, when the crystal is assigned to X-ray scanning, the afterglow will retard the illuminance and result in the blurring of the images. These low-afterglow CsI(Tl) inherit the advantages of high light yield from normal Csi(Tl) while restraining the afterglow phenomenon with high effectiveness, enhancing the image quality. The low-afterglow CsI(Tl) crystals are an excellent option for systems requiring high rates and scanning speed.

Hangzhou Shalom EO offers custom Low Afterglow CsI(Tl) scintillators; the products feature a low afterglow (%@20ms)0.05~0.39; we could tailor the value of afterglow upon your request. The products are available as CsI(Tl) blanks, polished crystals, encapsulated scintillators, CsI(Tl) arrays, CsI(Tl) array +PD assemblies, and 2-dimensional arrays upon customer's request. Our CsI scintillation crystals and CsI arrays feature excellent radiation hardness, high light output, and reliable robustness. Our CsI(Tl) crystals could be applied in diverse fields, including nuclear radiation detection, high energy physics, security X-radiation scanning machines, Industrial inspection, and medical equipment of Computerized Tomographic (CT) Scanning.

Figure 1. shows a pair of comparison curves of the afterglow of normal CsI(Tl) and our low afterglow CsI(Tl). Figure 2. shows a sample image obtained using our low afterglow CsI(Tl).