Thallium doped cesium iodide crystal, CsI tl, is one of the
brightest scintillation material. Its emission peak was at 550nm,
which was matched well with photodiode, thus the read-out system
can be much simplified .
Basic information of CsI tl scintillator
- Growth method: Bridgman
- Dimension(maximum): diameter 90 mm x 300 mm length
- Available items: CsI tl, CsI na and Pure CsI
Production of CsI tl scintillator
Cesium iodide crystal, CsI tl, was produced in EPIC Crystal by
using the modified Bridgman technique, with super pure 99.999%
cesium iodide(CsI) raw material and appropriate content of thallium
iodide(TII), and the toxygen scavenger was used, which can be well
reacted with oxide impurities at high temperature, ensured an
growing environment without the existing of oxygen, this was great
helpful for the production of high purity crystal. Meanwhile the
anti-radiation hardness was improved dramatically.
It is of great importance to ensure the non-homogeneous of light
output along the CsI tl crystal in Bridgman production, EPIC
Crystal developed the modified technique and controlled this well,
please refer to the PDF file, in which the experiment on a 220 mm
length CsI tl was conducted, the radiation source(Cesium 137)
located in both ends and middle place, the non-homogeneous of light
output in two ends showed less than 7%.
Main applications of CsI tl scintillator
CsI tl crystal mainly used in the nuclear radiation detection and
high energy physics, typically the BaBar experiment at standford
Linear Accelerator Center(SLAC) and Belle experiment at High Energy
Accelerator Research Organization(KEK). Moreover, in some
applications like X ray security inspection, the CsI tl was
generally fabricated into linear or 2d array, which has been the
strength in EPIC Crystal.