Published on 02-Mar-2024

Radiography Testing: An NDT Inspection Method

Radiography Testing: An NDT Inspection Method

Table of Content


Let's start this article first by understanding what radiography & radiography testing is all about. 

What Does Radiography Mean?

Radiography is a technique that uses X-rays and gamma rays, or related ionizing and non-ionizing radiation, to watch out for the internal structure of a subject in the form of an image.

Radiography Applications involve industrial radiography and medical radiography, i.e. “diagnostic and “therapeutic”. 

Industrial radiography falls under the Non-destructive Testing technique that enables different kinds of manufactured elements to go through the whole evaluation process in order to analyze the quality, value, and internal structure of the sample object.

X-rays or gamma rays, of them can be used in Industrial Radiography.

Industrial Radiography

X-rays and gamma rays are two different forms of electromagnetic radiation.

The primary difference present between different forms of Electromagnetic Energy is associated with wavelength.

X-rays and gamma rays, both of them have the shortest wavelength, and this feature enables numerous substances like carbon steel and many other metals to permeate, pass through, and depart.

Certain NDT Techniques involve Industrial Computed Tomography.

Significance of Radiography Testing 

Radiographic Testing (RT) is a widespread non-destructive testing (NDT) technique that makes use of x-rays or gamma rays to evaluate the innermost arrangement of the manufactured products to identify any drawbacks or defects present in the object.

During the radiography test, the test area is positioned between the source of the radiation and the detector or the Radiographic Film.

The thickness and density differences present in the test part of the material reduce the penetration of the radiation through interaction procedures that include absorption and dispersion.

The disparities in absorption are recorded consequently, either electronically or on the film(s).

There are numerous imaging NDT Techniques available in industrial radiography. 

Methods for illustrating the final image include real-time radiography(RTR), Film radiographic, Computed Radiography (CR), digital radiography(DR), and computed tomography (CT).

There are two distinct types of radioactive sources accessible for industrial use - X-ray and Gamma-ray.

These two radiation sources use higher energy levels, i.e. they are of shorter wavelength.

Radiographic Testing (RT) includes radioactivity, and because of this, it becomes necessary to abide by all the local rules & regulations during the entire process.