The optical characteristics of the sample based liquid crystal for using radiation detector

The digital radiation detectors are used clinically by diagnostic apparatus. However the digital radiation detector has some problem like high operating voltage, light blurring, low conversion efficiency and low fill factor. Thus we propose a new radiation detector that the photoconductor layer and liquid crystal layer are coupled in sandwich structure. X-ray absorption in the photoconductor layer controls the state of the liquid crystal via creation of charge carrier and the light modulation of liquid make image formation. The advantages of the new radiation detector are that high resolution image is acquired and the signal amplification is possible by external visible light source. In this study, we study the optical properties and electrical properties of the new radiation detector to irradiate X-ray. The HgI₂ was used by photoconductor material, and the aluminum is used by reflective layer. The thickness of HgI₂ is about 200 um and the operating voltage of the liquid crystal is from 1.5 V to 5 V. The electrical properties of HgI₂ were measured, and the transmission efficiency of liquid crystal was measured by modulation potential.