Den absolutte værdi af hen-
21
faldshastigheden N ' ( t ) kaldes
22
aktiviteten, der er givet ved:
23
24
Aktiviteten A ( t ) og antallet af
25
radioaktive kerner N ( t ) aftager
26
eksponentielt og med samme
27
halveringstid T = ln ( 2 ) / k
28
sekunder. Hvis et radioaktivt
29
stof har halveringstiden:
30
equals
31
så er henfaldskonstanten k,
32
hvis enhed her er sekunder
33
i minus første, givet ved:
34
equals
35
Antal kerner, der henfalder i
36
løbet af et sekund, når t = 100:
37
equals
38
Antal kerner, der henfalder i
39
løbet af et sekund, når t = 200:
40
equals
41
Punkter
42
46
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