The germanium isotope emits two weak gamma rays and a conversion electron.
2.
125 I ), 7 % of the decays emit energy as a gamma ray, while 93 % release energy as conversion electrons.
3.
The damage from the more penetrating gamma radiation and 127 keV internal conversion electron radiation from the initial decay of Te-123 is moderated by the relatively short half-life of the isotope.
4.
Excited Te-125 from EC decay of I-125 also emits a much lower-energy internal conversion electron ( 35.5 keV ), which does relatively little damage due to its low energy, even though its emission is more common.
5.
This excess energy can be either emitted from the nucleus as gamma radiation, or create and emit from the nucleus a new particle ( alpha particle or beta particle ), or transfer this excess energy to one of its electrons, causing that electron to be ejected as a conversion electron.
6.
The electron capture produces a tellurium-125 nucleus in an excited state with a half-life of 1.6 ns, which undergoes gamma decay emitting a photon or an internal conversion electron at 35.5 keV . A second electron relaxation cascade follows the gamma decay before the nuclide comes to rest.
7.
The remaining approximately 12 % of 99m Tc decays are by means of internal conversion, resulting in ejection of high speed internal conversion electrons in several sharp peaks ( as is typical of electrons from this type of decay ) also at about 140 keV ( 99m Tc ?! 99 Tc + + e " ).
8.
In the case of conversion electrons, the binding energy must also be taken into account : The energy of a conversion electron is given as E = ( E _ i-E _ f )-E _ B, where E _ i and E _ f are the energies of the nucleus in its initial and final states, respectively, while E _ B is the binding energy of the electron.
9.
In the case of conversion electrons, the binding energy must also be taken into account : The energy of a conversion electron is given as E = ( E _ i-E _ f )-E _ B, where E _ i and E _ f are the energies of the nucleus in its initial and final states, respectively, while E _ B is the binding energy of the electron.
10.
Just as an atom may produce an internal conversion electron in place of a gamma ray if energy is available from within the nucleus, so an atom may produce an Auger electron in place of an x ray if an electron is missing from one of the low-lying electron shells . ( The first process can even precipitate the second one . ) Like IC electrons, Auger electrons have a discrete energy, resulting in a sharp energy peak in the spectrum.
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