Abstract
The work describes an investigation of afterglow of various luminophores under influence of pulsed X-ray radiation of nanosecond duration. As a source of radiation a pulsed X-ray “Yasen 01” apparatus is applied. Maximum impulse current of an X-ray tube is 300 A. Maximum electron energy is 120 keV. Half-height pulse duration of an X-ray burst is about 30 ns. A pulse repetition rate is up to 4 kHz. Two types of X-ray luminophores based on gadolinium oxysulfide Gd2O2S:Tb and cesium iodide CsI:Tl have been investigated. The novelty of the work is use of a fast-acting solid-state semiconductor photomultiplier. It allows recording changes of luminophores luminosity in the nanosecond time range. The photomultiplier is characterized by having two discreet outputs for measuring quickly and slowly time-changing light flows. Presence of two signal outputs allows recording changes of luminophores luminosity both during fast nanosecond excitation and during long-time afterglow. Obtained data about the nature of afterglow of investigated luminophores makes it possible to select the best one for use in conjunction with a pulsed X-ray apparatus with a high pulse repetition rate.
Highlights
Different types of X-ray luminophores are used for creating modern digital flat panel detectors of X-ray radiation
The work describes an investigation of afterglow of various luminophores under influence of pulsed X-ray radiation of nanosecond duration
The optimal pulse-repetition rate depends on the luminophore afterglow duration, i.e. fading of the slow component
Summary
Different types of X-ray luminophores are used for creating modern digital flat panel detectors of X-ray radiation. This feature gains particular importance when X-ray visualizing devices are being irradiated by bursts of nanosecond pulses In this case the overall duration of dose accumulation by the detector is several times longer than the duration of the direct X-ray effect on the luminophore. The optimal pulse-repetition rate depends on the luminophore afterglow duration, i.e. fading of the slow component This X-ray luminophore excitation mode retains a high signal/noise ratio of the recording system and ensures obtaining images of high quality. These data are of high importance while operating pulse apparatuses in medical diagnostics for minimizing patient dose exposure.
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