Radioaktivitet: Forskelle mellem versioner
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Savfisk (diskussion | bidrag) m Gendannelse til seneste version ved Knud Winckelmann, fjerner ændringer fra 188.181.93.78 (diskussion | bidrag) |
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:<math>{}^2{}^{38}_{92}\hbox{U}\;\to\;{}^2{}^{34}_{90}\hbox{Th}\;+\;{}^4_2\hbox{He}</math>
=== Beta-henfald og K-indfangningflllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllll ===
{{Uddybende|Betahenfald}}
Kerner med neutron/proton-ubalance afvikler deres overskud af protoner eller neutroner ved et beta-henfald eller ved K-indfangning. I forlængelse af et alfa-henfald har en kerne almindeligvis for mange neutroner. Neutronoverskudet afvikles ved et beta-henfald. En betapartikel er en elektron der slynges ud af moderkernen med stor energi (op til 3 MeV). Elektronen er dannet ved henfaldet af en neutron:
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