A technique for measuring the variation of photon spectrum from X-ray generators over the mains voltage cycle

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Abstract
A system has been developed that enables the spectrometer to be synchronised to the mains voltage cycle so that variations in photon flux and the instantaneous spectra at selected parts of this cycle can be measured. The variation in photon flux is dependent upon the type of power supplies (both high and low tension), the tube current and the degree of filtration employed. Examples are given of the ripple of photon output due to the voltage and current ripple for a nominally constant potential generator and a half-wave rectified type. The way in which they interact to produce the measured variation is shown.

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