Difference between revisions of "Cosmogenic Radionuclides"
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| − | Written and developed by [http://www.mn.uio.no/kjemi/personer/vit/torbjor/index.html Prof. Tor Bjørnstad] (IFE/UiO) | + | Written and developed by [http://www.mn.uio.no/kjemi/personer/vit/torbjor/index.html Prof. Tor Bjørnstad] (IFE/UiO) |
Return to [[Naturally Occuring Radioactivity - NORM and TENORM]] | Return to [[Naturally Occuring Radioactivity - NORM and TENORM]] | ||
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Cosmic radiation permeates all of space, the source being primarily outside of our solar system. The radiation is in many forms, from high-speed heavy particles to high-energy photons and muons. The upper atmosphere interacts with many of the cosmic radiations, and produces radioactive nuclides in nuclear reactions. They can have long half-lives, but the majority have shorter half-lives than the primordial nuclides. Here is a table with some common cosmogenic nuclides:<br> | Cosmic radiation permeates all of space, the source being primarily outside of our solar system. The radiation is in many forms, from high-speed heavy particles to high-energy photons and muons. The upper atmosphere interacts with many of the cosmic radiations, and produces radioactive nuclides in nuclear reactions. They can have long half-lives, but the majority have shorter half-lives than the primordial nuclides. Here is a table with some common cosmogenic nuclides:<br> | ||
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<br>Some other cosmogenic radionuclides are <sup>10</sup>Be, <sup>26</sup>Al, <sup>36</sup>Cl, <sup>80</sup>Kr, <sup>32</sup>Si, <sup>39</sup>Ar, <sup>22</sup>Na, <sup>35</sup>S, <sup>37</sup>Ar, <sup>33</sup>P, <sup>32</sup>P, <sup>28</sup>Mg, <sup>24</sup>Na, <sup>38</sup>S, <sup>31</sup>Si, <sup>18</sup>F, <sup>39</sup>Cl, <sup>38</sup>Cl, <sup>34m</sup>Cl. | <br>Some other cosmogenic radionuclides are <sup>10</sup>Be, <sup>26</sup>Al, <sup>36</sup>Cl, <sup>80</sup>Kr, <sup>32</sup>Si, <sup>39</sup>Ar, <sup>22</sup>Na, <sup>35</sup>S, <sup>37</sup>Ar, <sup>33</sup>P, <sup>32</sup>P, <sup>28</sup>Mg, <sup>24</sup>Na, <sup>38</sup>S, <sup>31</sup>Si, <sup>18</sup>F, <sup>39</sup>Cl, <sup>38</sup>Cl, <sup>34m</sup>Cl. | ||
Revision as of 15:08, 20 June 2012
Written and developed by Prof. Tor Bjørnstad (IFE/UiO)
Return to Naturally Occuring Radioactivity - NORM and TENORM
Cosmic radiation permeates all of space, the source being primarily outside of our solar system. The radiation is in many forms, from high-speed heavy particles to high-energy photons and muons. The upper atmosphere interacts with many of the cosmic radiations, and produces radioactive nuclides in nuclear reactions. They can have long half-lives, but the majority have shorter half-lives than the primordial nuclides. Here is a table with some common cosmogenic nuclides:
| Cosmogenic Nuclides | ||||
| Nuclide |
Symbol |
Source |
Natural Activity | |
| Carbon 14 |
14C |
Cosmic-ray interactions, 14N(n,p)14C; |
6 pCi/g (0.22 Bq/g) in living organic material | |
| Tritium |
3H |
Cosmic-ray interactions with N and O; spallation from cosmic-rays, for instance 6Li(n,alpha)3H |
0.032 pCi/kg (1.2 x 10-3 Bq/kg) | |
| Beryllium 7 |
7Be |
Cosmic-ray interactions with N and O; |
0.27 pCi/kg (0.01 Bq/kg) | |
Some other cosmogenic radionuclides are 10Be, 26Al, 36Cl, 80Kr, 32Si, 39Ar, 22Na, 35S, 37Ar, 33P, 32P, 28Mg, 24Na, 38S, 31Si, 18F, 39Cl, 38Cl, 34mCl.
