High Aspect Ratio Single Crystal of Cesium Iodide Column

Abstract

Cesium iodide (CsI), which is used in the phosphor layer of a scintillator plate, exhibits a relatively high conversion rate of X- or g-rays to visible light. Important requirements for the scintillator materials used in the applications include high light output, transparency to the light it produces, high stopping efficiency, fast response, good proportionality, low cost, and availability in large volume In order to simplify and reduce the cost of the scintillator deposition process, we deposit the scintillator of a CsI into a high aspect ratio anodic aluminum oxide (AAO) template to produce CsI columns of nano and submicron sizes. The scintillator material of CsI columns were formed in the AAO template by a non-vacuum method. When the CsI melt is injected a confined to an AAO channel with a high aspect ratio, it grows as a stable single-crystal column with smooth surfaces, free of dendrites and grain boundaries. In this research, we design a novel cooling-function of electrochemical mold for a high quality AAO fabrication and compare the CsI wire and column formation by non-vacuum injection method in a AAO template.