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ELECTROMAGNETIC RADIATION (EMR)

Physics

ELECTROMAGNETIC RADIATION (EMR)

1. EMR is energy in the form of a self-propagating wave that travels across empty space or through matter.
2. In a vacuum, this energy travels at the speed of light (c) which is ~ 3 x 10 8 m/s.
3. EMR has both electrical and magnetic components.
4. Classified according to the frequency of its wave.
5. X-rays and gamma rays are both types of EMR - X-rays are emitted by electrons outside the nucleus, Gamma (γ) rays are emitted by the nucleus.
6. EMR behaves like a wave and a particle at the same time, represented as a stream of photons that travel in straight lines.


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REFERENCES

1. Bushberg, J. T. (2012). The essential physics of medical imaging. Philadelphia: Wolters Kluwer Health/Lippincott Williams & Wilkins. Find it at Amazon
2. Heggie, J. C., Liddell, N. A., & Maher, K. P. (1997). Applied imaging technology. Melbourne: St. Vincents Hospital.

Ⓒ A. Manickam 2018

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