1 in accordance with the second exemplary embodiment of fig3 the x ray cassette 1 is illustrated here sectioned in the line direction b the third erasing lamp 14 is arranged on the left hand side of fig4 it is located in a fashion offset to the side of the reflector 16 and the phosphor plate 15 at approximately the same distance from the reflector 16 and the phosphor plate 15 inside the x ray cassette 1 0027 fig5 shows an example of the application of a third exemplary embodiment of the x ray cassette 1 according to the invention in this example of application the x ray cassette 1 is inserted in an x ray table 20 this x ray table 20 includes an x ray base 23 in which the x ray cassette 1 is located and a supporting surface 24 arranged on this x ray base 23 patients are laid on this supporting surface 24 for x rays to be taken an x ray source 21 is fitted on the x ray table 20 over the supporting surface 24 and the x ray base 23 with the x ray cassette 1 located therein the x ray source 21 emits an x ray radiation 25 in the direction of the supporting surface 24 in order to take the x ray image the x ray cassette 1 present in the x ray base 23 here contains a detection means 22 which serves as a sensor for the x ray radiation 25 a sensor 22 can determine whether the x ray.