Extension of dynamic range in X-ray radiography using multi-color scintillation detector

• Published in: Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Vol. 501; no. 2; pp. 615 - 622
• Main Authors: Nittoh, Koichi, Oyaizu, Eiji, Sakurai, Tetsuo, Yoshida, Tadashi, Mochiki, Koh-Ichi
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.04.2003
• Subjects: Conversion screen; Red-light scintillator; Roentgen; X-ray radiography; Roentgen; X-ray radiography; Conversion screen; 87.59.Bh; Red-light scintillator
• ISSN: 0168-9002; 1872-9576
• DOI: 10.1016/S0168-9002(03)00424-8

A new imaging system using the multi-color scintillator Gd 2O 2S:Eu has been developed for the X-ray radiography. In this method a color Charge Coupled Device detects the weak blue and green photons associated with the transitions from the terms like 5D 1 and 5D 2 in the Eu-ions as well as the dominant red photons. As these transitions become appreciable and saturate at quite different intensity levels of the X-ray, we can realize a big extension of the dynamic range of the imaging almost by hundred times in comparison with the conventional monochromatic method. As a result, the new system makes it possible to take a clear image of any complex object, which consists of various parts of the different X-ray penetrability, from plastic to heavy metal, at a single shot.