Quantitative calibration system of X-ray imaging plate

Abstract

The invention discloses a quantitative calibration system of an X-ray imaging plate. The quantitative calibration system comprises a tungsten X-ray tube, a metal foil, a collimator, a non-standard shutter, a limiting hole, the X-ray imaging plate, a high-purity germanium spectrometer and a computer, wherein a tungsten X ray continuous spectrum emitted by the tungsten X-ray tube is emitted onto the metal foil through an outgoing opening and a Kalpha mono-energy linear spectrum is excited to be emitted and then is collimated by the collimator; the non-standard shutter is used for carrying out time window interception through controlling opening / closing of a collimation hole of the collimator; the mono-energy linear spectrum is emitted and penetrates through the limiting hole to be emitted into the X-ray imaging plate or the high-purity germanium spectrometer and then is recorded by the X-ray imaging plate or the high-purity germanium spectrometer. By adopting the quantitative calibration system of the X-ray imaging plate, calibration errors of the X-ray imaging plate are reduced and the quantitative calibration system has a relatively wide application prospect in the field of the X-ray imaging technology.

Description

technical field [0001] The invention belongs to the field of quantitative calibration of X-ray detector devices, and in particular relates to a quantitative calibration system of an X-ray imaging plate. Background technique [0002] The X-ray imaging panel is one of the three most important X-ray imaging detection devices in inertial confinement fusion (ICF). Because the X-ray imaging panel has a higher signal-to-noise ratio and sensitivity than X-ray film, it is better than X-ray CCD. Due to the characteristics of bending and large sensitive surface, it is widely used in quantitative detection fields such as electronic temperature measurement, X-ray emission imaging observation and spectral measurement. [0003] Quantitative detection using X-ray imaging plates requires quantitative calibration of its sensitivity, attenuation coefficient, linear response range, and absorption efficiency. At present, the tungsten X-ray continuum is commonly used to excite the Kα line spectr...

AI Technical Summary

Problems solved by technology

At present, the tungsten X-ray continuum is commonly used to excite the Kα line spectrum emission of different targets to calibrate different energy points. This method has the following disadvantages: 1. Since the Kα line is mixed in the bremsstrahlung continuum substrate, it is usually used internationally The absorption edge filter is used to purify the spectrum. However, the absorption edge filter will reduce the transmittance of Kα line, but relatively increase the transmittance of high-energy X-rays. Therefore, the lower limit of the spectral purity of the Kα line calibration light source that can be achieved is only 65%, the resulting calibration error is significant

2. Since the emission of the tungsten X-ray continuum needs a certain period of time to be stable, and the standard shutter is difficult to completely block high-energy X-rays, the error of the repeatability of the calibration light source, that is, the emission spectrum of the Kα line is 1%, which is very important for accurate calibration and even The precise measurement requirements in ICF precision physics experiments (for example: the asymmetry requirement of the implosion drive of the target capsule reaches 1%~2%), still needs to be reduced

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