Spectrum measurement using Medipix3 in Charge Summing Mode

Abstract

We have obtained first spectrum measurements on a Medipix3 detector with a cadmium telluride (CdTe) sensor using Charge Summing Mode (CSM). It will be shown that CSM in Medipix3 is capable of reducing the adverse effects of charge sharing and fluorescent x-rays of CdTe on the spectra recorded. The development of the Medipix All Resolution System (MARS) x-ray camera has allowed us to explore this novel pixel communication feature in Medipix3. Spectrum measurements in this work were carried out using a MARS camera consisting of a Medipix3 chip bump-bonded to a 1mm thick CdTe sensor layer. The characteristic peaks of the Am-241 source as well as the spectroscopic properties of the CdTe sensor material were depicted at a spatial resolution of 55 μm. Furthermore, a "connected component" algorithm shows a silicon based Medipix3 is effective in reallocating spread charge into a single pixel. © 2012 IOP Publishing Ltd and Sissa Medialab srl.