ASTM E1000 : 24

1.1 This guide is for tutorial purposes only and to outline the general principles of radioscopic imaging.

1.2 Much of the technology presented in this standard is rapidly becoming obsolete. In particular, direct viewing of phosphors or scintillators discussed is rarely used today. However, the material herein is relevant as baseline technology that has transitioned to digital technologies (See Guide E2736 for the transition to fully digital technologies).

1.3 This guide describes practices and image quality measuring systems for real-time, and near real-time, non-film detection, display, and recording of radioscopic images. Radioscopic imagery can be understood to be a live (real-time, or near real-time) presentation of X-ray radiographs that may or may not have been previously recorded. These images, used in materials examination, are generated by penetrating radiation passing through the subject material and producing an image on the detecting medium. Although the described radiation sources are specifically X-ray and gamma-ray, the general concepts can be used for other radiation sources such as neutrons. The image detection and display techniques are non-film, but the use of photographic film as a means for permanent recording of the image is not precluded.

1.4 This guide summarizes the state of radioscopic technology prior to the advent of Digital Detector Arrays (DDAs), which may also be used for radioscopic imaging. For a summary of DDAs, see Guide E2736. It should be noted that some detector configurations listed herein have similar foundations to those described in Guide E2736.

1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. For specific safety precautionary statements, see Section 6.

1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.