Difference Between X Ray And Gamma Ray Radiography Pdf
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- Radiation in medicine: Origins, risks and aspirations
- Radiographic Testing
- What are x-rays and gamma rays?
Radiation in medicine: Origins, risks and aspirations
The use of radiation in medicine is now pervasive and routine. From their crude beginnings years ago, diagnostic radiology, nuclear medicine and radiation therapy have all evolved into advanced techniques, and are regarded as essential tools across all branches and specialties of medicine. The inherent properties of ionizing radiation provide many benefits, but can also cause potential harm. This judgment requires not only medical knowledge, but also an understanding of radiation itself. This work provides a global perspective on radiation risks, exposure and mitigation strategies. Radiation is a form of energy which travels from a source as waves or as energized particles.
There are many different types of radiation — from the light that comes from the sun to the heat that is constantly coming off our bodies. But when talking about radiation and cancer risk, it is often x-rays and gamma rays that people think about. X-rays and gamma rays can come from natural sources, such as radon gas , radioactive elements in the earth, and cosmic rays that hit the earth from outer space. But this type of radiation can also be man-made. X-rays and gamma rays are created in power plants for nuclear energy, and are also used in smaller amounts for medical imaging tests, cancer treatment, food irradiation, and airport security scanners. X-rays and gamma rays are both types of high energy high frequency electromagnetic radiation. They are packets of energy that have no charge or mass weight.
The history of radiographic testing actually involves two beginnings. Radiography X-ray uses X-rays and gamma-rays to produce a radiograph of a specimen, showing any changes in thickness, defects internal and external , and assembly details to ensure optimum quality in your operation. RT usually is suitable for testing welded joints that can be accessed from both sides, with the exception of double-wall signal image techniques used on some pipe. Although this is a slow and expensive NDT method, it is a dependable way to detect porosity, inclusions, cracks, and voids in weld interiors. RT makes use of X-rays or gamma rays.
Both forms of ionizing radiation are almost identical with exception to their source of origination. Gamma rays originate from the nucleus while X-rays originate in the electron fields surrounding the nucleus or are machine produced.
Manufacturers use industrial radiography to check for cracks or flaws in materials. Industrial radiography uses x-ray and gamma radiation to show flaws that cannot be detected by the naked eye.
What are x-rays and gamma rays?
In physics , radiation is the emission or transmission of energy in the form of waves or particles through space or through a material medium. Radiation is often categorized as either ionizing or non-ionizing depending on the energy of the radiated particles. Ionizing radiation carries more than 10 eV , which is enough to ionize atoms and molecules and break chemical bonds. This is an important distinction due to the large difference in harmfulness to living organisms. Other sources include X-rays from medical radiography examinations and muons , mesons , positrons, neutrons and other particles that constitute the secondary cosmic rays that are produced after primary cosmic rays interact with Earth's atmosphere. Gamma rays, X-rays and the higher energy range of ultraviolet light constitute the ionizing part of the electromagnetic spectrum.
The key difference between gamma rays and X-rays is how they are produced. Gamma rays originate from the settling process of an excited nucleus of a radionuclide after it undergoes radioactive decay whereas X-rays are produced when electrons strike a target or when electrons rearrange within an atom.
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X-rays vs Gamma rays. Gamma rays, x-rays, visible light and radio waves are all types forms of electromagnetic radiation. Electromagnetic radiation can be described in terms of a stream of photons, which are particles without mass, each traveling in a wave-like pattern and moving circling at the speed of light.