The process of pair production is the creation of a particle and its antiparticle. Here, the two particles are converted back into two photons of electromagnetic radiation, each of 0.511 MeV energy traveling at 180 degrees to each other (a concept utilized in Pair production in reality does not become the dominant process in water below about 30 MeV (due to its dependence on the 'Z' of absorber) and is therefore of less importance in the low atomic number soft tissue elements. The electron is quickly absorbed, however the fate of the positron is not so straight forward. This particular process does not involve orbital electrons, rather the interaction occurs near the nucleus of the atom instead. Pair Production. {"url":"/signup-modal-props.json?lang=us\u0026email="}{"containerId":"expandableQuestionsContainer","displayRelatedArticles":true,"displayNextQuestion":true,"displaySkipQuestion":true,"articleId":31661,"mcqUrl":"https://radiopaedia.org/articles/pair-production/questions/657?lang=us"} Pair production occurs only for gamma-rays of high energy. In industrial radiography where high atomic number elements are irradiated, pair production can become the major attenuation process assuming the incident radiation energy exceeds 1.022 MeV. In Gamma-rays of higher energy, rather than interacting with the field of the whole atom as in the photoelectric effect, interact with the field of one electron directly.
With regard to radiation measurements, the important feature of all of these interactions is that electron-hole pairs are generated in a detector and can be detected The probability for the photoelectric effect decreases with increasing γ-ray energy. Pair production can only occur if the incident photon energy is at least 1.022 MeV.
If a photon with a minimum energy of the rest mass of an electron and a positron hits a nucleus an electron and a positron is emitted. It is largest for the most tightly bound electrons and thus the absorption coefficient for the photoelectric effect increases in the order of electron shells K > L > M >, etc. The surplus energy appears as the kinetic energy of the two created particles. A given positron emitted by pair production or by βWhen the energy of the incident photon is greater than 1.02 The absorption of photons as they pass through an absorbing medium follows an exponential law: ScienceDirect ® is a registered trademark of Elsevier B.V.URL: https://www.sciencedirect.com/science/article/pii/B0123693977005252URL: https://www.sciencedirect.com/science/article/pii/B012227410500274XURL: https://www.sciencedirect.com/science/article/pii/B012369401900632XURL: https://www.sciencedirect.com/science/article/pii/B9780124366039500065URL: https://www.sciencedirect.com/science/article/pii/B012227410500185XURL: https://www.sciencedirect.com/science/article/pii/B0123693977006695URL: https://www.sciencedirect.com/science/article/pii/S0080878408627520URL: https://www.sciencedirect.com/science/article/pii/B9780750674638500066URL: https://www.sciencedirect.com/science/article/pii/B9780080959757012080URL: https://www.sciencedirect.com/science/article/pii/B9780123848734000050Encyclopedia of Analytical Science (Second Edition)Encyclopedia of Physical Science and Technology (Third Edition)NUCLEAR RADIATION, ITS INTERACTION WITH MATTER AND RADIOISOTOPE DECAYHandbook of Radioactivity Analysis (Second Edition)The negatron or negative beta particle, produced by β decay or by Encyclopedia of Physical Science and Technology (Third Edition)Photons interact with matter through three primary mechanisms: the photoelectric effect, Compton scattering, and X-RAY ABSORPTION AND DIFFRACTION | X-Ray AbsorptionEncyclopedia of Analytical Science (Second Edition)MeV, the photon may be absorbed through the mechanism of X-rays and gamma rays interact with matter mainly by three basic processes: photoelectric absorption, Compton scattering, and Radiochemistry and Nuclear Chemistry (Third Edition) by four different processes: coherent scattering, photoelectric effect, Compton effect, and High-energy muons interact with the mineral crystals as they pass through. These two particles form the pair referred to in the name of the process. The electrons scattered (photoelectric effect or Compton scattering) or generated (ScienceDirect ® is a registered trademark of Elsevier B.V. There is a variety of reactions involved, including ion-, the three typical interactions of electromagnetic radiation with matter have been detailed.
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