The saturation intensity was measured with no aluminium in the path of the beam. the count rate (with the block in place) begins to level off at higher emission currents with only about half of the count rate of the beam whose path was unimpeded.
Part of an experiment involved measuring the intensity of an X-ray beam through a piece of aluminium as a function of emission current of the X-ray source. I originally fitted a linear fit to my data (although it does start to level off at high emission currents). The marker however said that it...