T.O. 33B-1-16-1CHAPTER 6SECTION IRADIOGRAPHIC INSPECTION6 BASICFUNDAMENTALSOFRADIOGRAPHICINSPECTION.6.1 INTRODUCTION.6.1.1 General.This chapter will provide guidance for radiographic inspection. Additional helpful material is cited in the form ofreferences, primarily books and standards. The references are listed at the end of this chapter.6.1.1.1 BasicsofRadiographicInspection.X and gamma radiographic inspection uses the penetrating abilities of electromagnetic radiation to examine the interiorof objects. Three prime factors determine the amount of information that radiography can provide about an object.a. The composition of the object.b. The product of the density and the thickness of the material making up the object.c. The energy of the X or gamma rays incident upon the object.Discontinuities within the object can cause localized changes in the first two characteristics above and thus, becomedetectable.6.1.1.2 GeneralNatureOfXandGammaRadiation.X-rays and gamma rays are forms of electromagnetic radiation, as are visible light, ultraviolet light, infrared radiation,microwaves and radio waves. All together these types of radiation make up the electromagnetic spectrum. (Figure 6-1).Electromagnetic radiation is dualistic; that is, it exhibits some characteristics of a wave and some characteristics of aparticle. In this case the particle is called a photon, which is a quantum of light. Depending upon the application, X-rays may exhibit more wave-like behavior or more quantum-like behavior.Figure 6-1. Electromagnetic Spectrum.
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