| http://www.w3.org/ns/prov#value | - Advantageously, at least first electrode 14 is formed of a light material, such as aluminum and the like, having substantially no absorption of X-ray photons having energies commonly encountered in medical diagnostic apparatus, e.g. on the order of 60 KeV. A source 16 of electrical potential of magnitude V is coupled between first and second electrodes 14 and 15 with polarity selected to form an e
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