Timepix Radiation Detector for Autonomous Radiation Localization and Mapping by Micro Unmanned Vehicles A system for measuring radiation intensity and for radiation mapping by a micro unmanned robot using the Timepix detector is presented in this paper. Timepix detectors are extremely small, but powerful 14 xc3x97 14 mm, 256 xc3x97 256 px CMOS hybrid pixel detectors, capable of measuring ionizing alpha, beta, gamma radiation, and heaving ions. The detectors, developed at CERN, produce an image free of any digital noise thanks to perpixel calibration and signal digitization. Traces of individual ionizing particles passing through the sensors can be resolved in the detector images. Particle type and energy estimates can be extracted automatically using machine learning algorithms. This opens unique possibilities in the task of flexible radiation detection by very small unmanned robotic platforms. The detectors are well suited for the use of mobile robots thanks to their small size, lightweight, and minimal power consumption. This sensor is especially appealing for micro aerial vehicles due to their high maneuverability, which can increase the range and resolution of such novel sensory system. We present a ROSbased readout software and realtime image processing pipeline and review options for 3D localization of radiation sources using pixel detectors. The provided software supports offtheshelf FITPix, USB Lite readout electronics with Timepix detectors.

A full functional Monolithic Active Pixel Sensor prototype for the CEPC vertex detector The proposed Circular ElectronPositron Collider (CEPC) presents new challenges for pixel detectors in terms of cell size and functionality. A high data rate digital design and readout architecture of a Monolithic Active Pixel Sensor (MAPS) prototype for the CEPC vertex detector is presented. The MAPS prototype, together with the column drain based readout architecture, benefiting from the ALPIDE (ALice PIxel DEtector) and FEI3 approaches, has been implemented to achieve high spatial resolution, fast readout, and low power consumption. The simulation results indicate the readout logic works properly with input data rates of 120MHz; while both analog frontend and inpixel readout logic meet the 25ns bunch spacing constraint.