 This level of heat, when combined with the Bremsstrahlung X-rays, acts to increase the amount and rate of degradation for certain materials.Monochromatised X-ray sources, because they are farther away (50–100 cm) from the sample, do not produce noticeable heat effects.In those, a quartz monochromator system diffracts the Bremsstrahlung X-rays out of the X-ray beam, which means the sample is only exposed to one narrow band of X-ray energy.