and is converted into a digital value by an a d converting circuit 62 that is connected to the charge amp 61 which digital value is stored in the memory unit 71 where upon the completion of the reading of all of the applicable pixels du after the digital values have been stored to the memory unit 71 the data that is stored in the memory unit 71 is sent to the image processing unit 8 moreover the controller 7 outputs a reading interval in process signal to the temperature controlling means 9 the temperature controlling means 9 comprise a thermister 91 a peltier element 92 an a d converting circuit 93 for converting the voltage signal of the thermistor 91 into a digital signal a d a a converting circuit 94 for outputting a voltage to the peltier element 92 and a cpu 90 the software loaded into the cpu 90 uses as inputs the reading interval in process signal that is outputted from the controller 7 and the digital values from the a d converter circuit 93 to determine the control voltage value for the peltier element 92 outputted into the d a converting circuit 94 this software and the structure of the controller 7 are explained in detail in examples of embodiment 1 through 3 below example of embodiment 1 the present example of embodiment will be explained in reference to fig2 in fig2 the aforementioned frame synchronization signal i the aforementioned x ray illumination interval ii the reading interval in processes signal iii the driving voltage iv that should actually be applied to the peltier element 92 and the driving voltage that is actually applied to the peltier element 92 v are each shown aligned with the respective time marks the controller 7 after activating the.