Velocity factor - Revision history

68.198.133.72: variables in italic, labels in roman, except acronym variables which are also roman

2014-06-22T15:00:58Z

variables in italic, labels in roman, except acronym variables which are also roman

← Older revision		Revision as of 17:00, 22 June 2014
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109.212.234.251: /* See also */

2014-02-14T03:18:06Z

en>SBareSSomErMig: Undid revision 592938828 by SBareSSomErMig (talk), nevermind, that wasn't a typo

2014-01-29T09:58:47Z

Undid revision 592938828 by SBareSSomErMig (talk), nevermind, that wasn't a typo

New page

{{Infobox isotope

| alternate_names =
| symbol =N
| mass_number =13
| mass =
| num_neutrons =6
| num_protons =7
| abundance =
| halflife = 9.97 min
| error_halflife =
| text_color =
| image =
| decay_product = [[Carbon-13]]
| decay_symbol =
| decay_mass =
| decay_mode1 = [[Electron capture]]
| decay_energy1 =
| decay_mode2 =
| decay_energy2 =
| decay_mode3 =
| decay_energy3 =
| decay_mode4 =
| decay_energy4 =
| parent = Oxygen-13
| parent_symbol = O
| parent_mass = 13
| parent_decay = [[Electron capture]]
| parent2 =
| parent2_symbol =
| parent2_mass =
| parent2_decay =
| spin =
| excess_energy =
| error1 =
| binding_energy =
| error2 =

}}
'''Nitrogen-13''' is a [[radioisotope]] of [[nitrogen]] used in [[positron emission tomography]] (PET). It has a [[half life]] of a little under ten minutes, so it must be made at the PET site. A [[cyclotron]] may be used for this purpose.

Nitrogen-13 is used to tag [[ammonia]] molecules for PET myocardial perfusion imaging.

==Production==

:H1 + O16 → N13 + He4

The proton must be accelerated to a [[kinetic energy]] of about 5.55 Mev or a little more.

The reaction is [[endothermic]] (i.e. the mass of the products is greater than the reactants, so energy needs to be supplied which is converted to mass).This is one reason why the proton needs to carry extra [[energy]] to produce the [[nuclear reaction]].

The energy difference is actually 5.22 MeV, but if the proton only supplied this energy the reactants would be formed with no kinetic energy. As [[momentum]] must be [[conservation laws|conserved]], the true energy that needs to be supplied by the proton is given by:

:<math>K =(1+m/M) |E|</math>

==Role in stellar fusion==
[[Image:CNO Cycle.svg|300px|right|thumbnail|The N-13 role in the CNO Cycle.]]
Nitrogen-13 plays a significant role in the [[CNO cycle]], which is the dominant source of energy in stars heavier than the [[sun]].<ref>{{cite book|author=Phillips, A.C. |title=The Physics of Stars |publisher=John Wiley & Sons |year=1994|isbn=0-471-94057-7}}
</ref>

:{| border="0"
|- style="height:2em;"
|{{Nuclide|Link|carbon|12}} ||+ ||{{Nuclide2|hydrogen|1}} ||→ ||{{Nuclide2|nitrogen|13}} ||+ ||{{SubatomicParticle|link=yes|Gamma}} || || ||+ ||1.95 [[electron volt|MeV]]
|- style="height:2em;"
|{{Nuclide|Link|nitrogen|13}} || || ||→ ||{{Nuclide2|carbon|13}} ||+ ||{{SubatomicParticle|link=yes|Positron}} ||+ ||{{SubatomicParticle|link=yes|Electron Neutrino}} ||+ ||1.20 [[electron volt|MeV]]
|- style="height:2em;"
|{{Nuclide|Link|carbon|13}} ||+ ||{{Nuclide|Link|hydrogen|1}} ||→ ||{{Nuclide|Link|nitrogen|14}} ||+ ||{{SubatomicParticle|link=yes|Gamma}} || || ||+ ||7.54 [[electron volt|MeV]]
|- style="height:2em;"
|{{Nuclide|Link|nitrogen|14}} ||+ ||{{Nuclide|Link|hydrogen|1}} ||→ ||{{Nuclide|Link|oxygen|15}} ||+ ||{{SubatomicParticle|link=yes|Gamma}} || || ||+ ||7.35 [[electron volt|MeV]]
|- style="height:2em;"
|{{Nuclide|Link|oxygen|15}} || || ||→ ||{{Nuclide|Link|nitrogen|15}} ||+ ||{{SubatomicParticle|link=yes|Positron}} ||+ ||{{SubatomicParticle|link=yes|Electron Neutrino}} ||+ ||2.75 [[electron volt|MeV]]
|- style="height:2em;"
|{{Nuclide|Link|nitrogen|15}} ||+ ||{{Nuclide|Link|hydrogen|1}} ||→ ||{{Nuclide|Link|carbon|12}} ||+ ||{{Nuclide|Link|helium|4}} || || ||+ ||4.96 [[electron volt|MeV]]
|}

==External links==
*[http://www.petnm.unimelb.edu.au/pet/index.html PET site] of the [[University of Melbourne]]

==References==

{{Reflist}}

{{Isotope|element=nitrogen
|lighter=[[nitrogen-12]]
|heavier=[[nitrogen-14]]
|before=[[oxygen-13]] '''([[electron capture]])
|after=[[carbon-13]] '''(EC)
}}

[[Category:Isotopes of nitrogen]]