| http://www.w3.org/ns/prov#value | - The efficiency of the conversion of electrical energy to x-ray energy is sometimes expressed by a simple empirically derived formula of the form Ex=E*kZVx where Ex is the x-ray energy, E is the electrical energy, k is a constant, Z is the atomic number of the target, V is the voltage, and x is a power generally accepted to be a little less than 2.
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