Electrical characteristics of microdot sensors for X-ray imaging applications

In this paper, a recently interested radiation sensor operating in the gas proportional mode, the so-called microdot-typed radiation sensor, is described for inherently two-dimensional (2-D) readout capability. We present new observations and measurements realized with the microdot-typed sensor of a 50-μm pitch, including gas gain, rate capability, aging effect, and insensitive zone. The intrinsically 2-D structure of this sensor makes it attractive for potential applications, such as X-ray imaging devices and tracking sensors, at colliders for the next-generation synchrotron radiation sources.