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radiation measurement (technology) :: Pair production -- Britannica Online Encyclopedia
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radiation measurement

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Pair production

A third gamma-ray interaction process is possible when the incoming photon energy is above 1.02 MeV. In the field of a nucleus of the absorber material, the photon may disappear and be replaced by the formation of an electron-positron pair. The minimum energy required to create this pair of particles is their combined rest-mass energy of 1.02 MeV. Therefore, pair production cannot occur for incoming photon energies below this threshold. When the photon energy exceeds this value, the excess energy appears as initial kinetic energy shared by the positron and electron that are formed. The positron is a ... (100 of 18328 words)

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"radiation measurement." Encyclopædia Britannica. 2010. Encyclopædia Britannica Online. 17 Sep. 2010 <http://www.britannica.com/EBchecked/topic/1357248/radiation-measurement>.

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radiation measurement. (2010). In Encyclopædia Britannica. Retrieved September 17, 2010, from Encyclopædia Britannica Online: http://www.britannica.com/EBchecked/topic/1357248/radiation-measurement

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  • Figure 1: (A) A simple equivalent circuit for the development of a voltage pulse at the output of a … [ Encyclopædia Britannica, Inc.]
  • Figure 2: (Left) Pulse-processing units commonly used in a pulse-counting system. (Right) The units … [Encyclopædia Britannica, Inc.]
  • Figure 3: Representative pulse-height spectra for a source emitting gamma rays of many different … [After J.C. Philippot, Transactions on Nuclear Science NS-17 (3), 446, adapted from G.F. Knoll, Radiation Detection and Measurement, 2nd ed. (1989), John Wiley and Sons, Inc.]
  • Figure 4: A simple pulse-height spectrum (such a spectrum might be recorded from a scintillator for … [Encyclopædia Britannica, Inc.]
  • Figure 5: Current-voltage characteristics of an ion chamber. [Encyclopædia Britannica, Inc.]
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  • Figure 1: (A) A simple equivalent circuit for the development of a voltage pulse at the output of a … [ Encyclopædia Britannica, Inc.]
  • Figure 2: (Left) Pulse-processing units commonly used in a pulse-counting system. (Right) The units … [Encyclopædia Britannica, Inc.]
  • Figure 3: Representative pulse-height spectra for a source emitting gamma rays of many different … [After J.C. Philippot, Transactions on Nuclear Science NS-17 (3), 446, adapted from G.F. Knoll, Radiation Detection and Measurement, 2nd ed. (1989), John Wiley and Sons, Inc.]
  • Figure 4: A simple pulse-height spectrum (such a spectrum might be recorded from a scintillator for … [Encyclopædia Britannica, Inc.]
  • Figure 5: Current-voltage characteristics of an ion chamber. [Encyclopædia Britannica, Inc.]
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