CsI:Tl
Cesium iodide activated by thallium is a scintillation material with high absorption power. It can be used as an efficient gamma ray absorber. CsI:Tl is soluble in water, but is not hygroscopic in laboratory conditions. It has high resistance to mechanical and thermal shocks. CsI:Tl can be easily fabricated into wide a variety of shapes and geometries. It can also be fabricated into detection matrices.
For more information see Scintillation material data