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Besides the limitations of increased sample heating, large focused electron beams from higher beam currents, and beam current stability, there are processes within the proportional counter and detector electronics limiting the count rate.
Petre credits the shadowy findings to ROSAT's Position-Sensitive Proportional Counter, particularly its ability to distinguish real X-rays from spurious electronic signals.
A fragment of a large crystal grown for neutron diffraction studies and the availability of one of the first commercially produced x-ray area-detector system, a Xentronics (#) multiwire image proportional counter, led to one of the highest-resolution datasets for an enzyme, 1.
Using observations of the Imaging Proportional Counter on the Einstein Observatory satellite, they found first that the intensity of X-ray halos represents an amount of dust consistent with what astrophysicists had calculated from the observed absorption of visible light.