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Atomphysik
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Atomphysik Der Radioaktive Zerfall& Die halbwertszeit
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Der Radioaktive Zerfall :Radioaktive Strahlen sind Kernstrahlungen
.
findet ein Zerfall , eine
Es Elementumwandlung statt .
a) Der a Zerfall :
He
226 222 2n
Ra < Rn
+
88 86 2p
Radon
-Strahlung
3) Der B-Zerfall :
B Teilchen sind Elektronen aus dem Atomkern !
Sie entstehen bei der
Umwandlung eines Neutrons in ein Proton !
1
e
1
& +
Cantinentrind
n D
G 1
< mit
214
Ph
82 B-Strahlung
(Bismut)
Die Halbwertszeit T112
Die Halbwertszeit gibt die Dauer an , in welcher die Anzahl des am
Anfang vorhandenen strahlenden Kerne auf die Hälfte
reduziert wird.
Die Halbwertszeit ist für jeden radioaktiven Stoff unterschiedlich
und lässt sich durch äußere Einflüsse (z .
.
B Hitze) beeinflussen .
Masse in
26 /Tel2 1620 (Jahre)
kg
: a
↑ Ra
GUkg 1001 .
*
Zerfallskurve
32kg 50 % - X
16129 25%. X
12 ,5%-
819 X
6
. 25%. - X
419
I I I I /Zeit
1620a 3240G 48609 64809
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