Radiation monitoring device

A radiation detector for measuring one or more characteristics of a radiation, comprising an array of detector pixels, a clock pulse generator, the array of detector pixels comprising at least a first detector pixel and a second detector pixel, the first detector pixel and the second detector pixel separately comprising:

• a sensor producing an electrical signal in response to an event of a photon or charged particle of said radiation impinging on said sensor;
• pixel electronics configured to receive and process said electrical signal, the pixel electronics comprising:
• an analog processing unit for amplifying and shaping said electrical signal and producing a shaped pulse,
• a time determination unit for counting a TOT-count, the TOT-count being the number of clock pulses occurring during the time interval when said shaped pulse is above a threshold, and
• a plurality of event counters, individual ones of the plurality of the event counters configured to count a number of events having a TOT-count in different predefined ranges, the predefined ranges being defined by digital energy thresholds;
• wherein the predefined ranges of the individual event counters of the first detector pixel differ at least in part from the predefined ranges of the individual event counters of the second detector pixel;
• wherein the radiation detector further comprises a copy unit, said copy unit comprising a receiving device configured to receive a TOT-count value, a set of output ports copying said TOT-count value, a set of comparing units, each comparing unit comprising a set of TOT-count limit values, defining a set of TOT-count ranges, and being associated with an event counter, and comprising a detecting device configured to detect when a measured TOT-count is within or above a range, and an incrementing device configured to increment an event counter when a measured TOT-count is within or above associated range.