Method for measuring the detection sensitivity of an X-ray device

A method for measuring the detection sensitivity of a detector of an X-ray machine, where a detection signal of the detector produces detection images with a product grey value having a defined resolution, and where the product grey value is analyzed for the purpose of detecting foreign matter in a product, the method comprising the following steps:

• in a test body analysis phase, for determining the parameters of a product inspection:
• capturing a detection image of the product while there are also a number of test bodies present, the test bodies having a defined material and a defined size;
• and
• measuring and storing of attenuation values of the product by determining an attenuation of the detection signal in the detection image of the product caused by the test bodies;
• during a continuous product inspection phase:
• capturing a product grey value;
• relating the product grey value, at a plurality of positions, to the stored attenuation values for the test bodies in order to produce resultant grey values;
• and
• determining the detection sensitivity by an analysis of the resultant grey values.