Abstract: A multi-channel digital to analog converter, DAC, comprising: a DAC configured to provide an analog signal comprising a plurality of time division multiplexed sub-signals, each provided for one of a plurality of output channels; wherein each of the output channels include: a sampling capacitor; a selector switch configured to couple the sampling capacitor of the respective output channel to the output terminal of the DAC such that the sampling capacitor samples the analog signal over a plurality of discrete sampling periods; a comparator configured to provide a comparator output signal, wherein the sampling capacitor is coupled to an input terminal of the comparator; and an output control gate configured to control whether or not the comparator output signal is output from the respective output channel at a predetermined time later than a first of the respective plurality of discrete sampling periods.

Abstract: The invention relates to a method for characterising the quality of an X-ray beam having a known profile for depositing a dose in a body, having an zone (Za1, Za2) of increasing dose rate inside said body extending between the input surface of the beam and a characteristic depth (Pmax) where the deposited dose is at a maximum, the method comprising the following steps: —providing a monolithic detector including in p-n junctions (m>3) stacked depth-wise in the detector with at least three junctions distributed in the zone of increasing dose rate; —projecting said X-ray beam onto the monolithic detector; —recovering the m signals (r) delivered by the p-n junctions of the detector; —and processing the m signals (r) in order to characterise the quality of the X-ray beam.