Compton effect
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Compton effect or Compton scatter is the main cause of scattered radiation in a material. It occurs due to the interaction of the X-ray or gamma photon with the outermost (and hence loosely bound) valence electron at the atomic level. The resultant incident photon gets scattered (changes direction) as well as ejects the electron (recoil electron), which further ionizes other atoms. Therefore the Compton effect is a partial absorption process and as the original photon has lost energy, this is known as Compton shift (the shift being a shift of wavelength/frequency).
Probability of Compton effect
- directly proportional to
- number of outer shell electrons, i.e.
, thethe electron density. - physical density
ofof material
- number of outer shell electrons, i.e.
- inversely proportional to
- photon energy
- does not depend on
- atomic number (unlike photoelectric effect and pair production)
History and etymology
Named after Professor Arthur Holly Compton (1892-1962), US physicist, who was awarded the Nobel Prize in Physics in 1927 for his discovery of Compton effect 2.
-<p><strong>Compton effect</strong> or Compton scatter is the main cause of scattered radiation in a material. It occurs due to the interaction of the X-ray or gamma photon with the outermost (and hence loosely bound) valence electron at the atomic level. The resultant incident photon gets scattered (changes direction) as well as ejects the electron (recoil electron), which further ionizes other atoms. Therefore the Compton effect is a partial absorption process and as the original photon has lost energy, this is known as Compton shift (the shift being a shift of wavelength/frequency).</p><h5>Probability of Compton effect </h5><ul>- +<p><strong>Compton effect</strong> or <strong>Compton scatter</strong> is the main cause of scattered radiation in a material. It occurs due to the interaction of the X-ray or gamma photon with the outermost (and hence loosely bound) valence electron at the atomic level. The resultant incident photon gets scattered (changes direction) as well as ejects the electron (recoil electron), which further ionizes other atoms. Therefore the Compton effect is a partial absorption process and as the original photon has lost energy, this is known as Compton shift (the shift being a shift of wavelength/frequency).</p><h5>Probability of Compton effect </h5><ul>
-<li>number of outer shell electrons, i.e., the electron density.</li>-<li>physical density of material</li>- +<li>number of outer shell electrons, i.e. the electron density</li>
- +<li>physical density of material</li>
-<li>does not depend on<ul><li>atomic number (unlike <a href="/articles/photoelectric-effect">photoelectric effect</a> and <a title="pair production)" href="/articles/pair-production">pair production)</a>- +<li>does not depend on<ul><li>atomic number (unlike <a href="/articles/photoelectric-effect">photoelectric effect</a> and <a href="/articles/pair-production">pair production)</a>
-</ul>- +</ul><h4>History and etymology</h4><p>Named after <strong>Professor Arthur Holly Compton</strong> (1892-1962), US physicist, who was awarded the Nobel Prize in Physics in 1927 for his discovery of Compton effect <sup>2</sup>. </p>
References changed:
- 1. Simpkin D. The AAPM/RSNA Physics Tutorial for Residents. (1999) RadioGraphics. <a href="https://doi.org/10.1148/radiographics.19.1.g99ja18155">doi:10.1148/radiographics.19.1.g99ja18155</a> <span class="ref_v4"></span>
- 2. L'Annunziata MF. Radioactivity. Elsevier Science. ISBN:044452715X. <a href="http://books.google.com/books?vid=ISBN044452715X">Read it at Google Books</a> - <a href="http://www.amazon.com/gp/product/044452715X">Find it at Amazon</a><span class="auto"></span>
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