A radiation detector and a method are for synchronized radiation detection. The radiation detector has a two-dimensional arrangement of radiation sensors using APS technology, and evaluation electronics with an input for a synchronization signal. The evaluation electronics have two or more free-running current/frequency converters for conversion of analog signals from the radiation sensors to digital signals. A correction unit is also provided for correction of errors in the digital signals which are caused by time discrepancies in a nominal time period, which is predetermined by the synchronization signal, for detection of the radiation from conversion events of the free-running current/frequency converters. The radiation detector can be produced at low cost, and allows simplified and scalable modular construction.