A Partial-Volume Correction for Quantitative Spectral X-Ray Radiography

X-ray radiography offers the ability to noninvasively inspect the internal structure and material composition of objects. Dual-energy radiography allows material discrimination but is limited in quantitative material measurements due to the broad nature of the interrogating x-ray spectrum. Spectral radiography detectors provide an observation of not just the number of x rays that are transmitted through a sample but also the spectrum. Here, experimental validations of a method to use spectral x-ray radiography to accurately quantify the uranium mass in a powder are presented. An accurate system response model was developed, which includes a model of the incident x-ray source spectrum and a pixel-wise detector response that describes how the transmitted x rays were observed. Further, a calibration to account for the effect of partial x-ray attenuation was developed. The method is demonstrated to be capable of estimating the uranium mass in a variety of uranium oxide powders to a bias of −0.01±0.62%.

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Quantitative uranium elemental reconstruction using spectral x-ray radiography

Gilbert

McDonald

Kasparek

et al. 2023

Journal of Applied Physics

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Contrast-based notch-to-crack transfer function for digital radiography

Kenderian,

Case,

Adams

et al. 2024

insight

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To simulate cracks, a series of slits with depths ranging from 17.2% to 40% of 301 stainless steel (SS) plate thickness are fabricated for this study. The examination includes a microfocus X-ray tube and a digital detector array (DDA) with 75 ??m pixel pitch. The basis of this study is to determine the effect of detector scintillator blur, noise and pixelation on the contrast of the resultant radiographic image and, ultimately, on the detectability of a crack. Many crack detectability studies are performed on notched plates rather than true cracks. As the notch width becomes smaller than a pixel, the grey value of the image it generates will be averaged over the entire footprint of the pixel. Therefore, the contrast with neighbouring (no notch) pixels is reduced. This study develops a relationship between the material property, detector parameters, notch geometry and expected contrast that would result from the radiograph image. This relationship can be used as a transfer function towards evaluating the resultant contrast from a notch and extrapolating the results towards a hairline crack.

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A Partial-Volume Correction for Quantitative Spectral X-Ray Radiography

Cited by 2 publications

References 31 publications

Quantitative uranium elemental reconstruction using spectral x-ray radiography

Quantitative uranium elemental reconstruction using spectral x-ray radiography

Contrast-based notch-to-crack transfer function for digital radiography

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