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Aktivitet<br />

En stofmængde med N radioaktive atomer har aktiviteten A:<br />

AAntal t l hhenfald f ld (k (kerneomdannelser, d l disintegrationer) di i t ti ) pr. tid tidsenhed. h d<br />

N<br />

A<br />

<br />

dN<br />

dt<br />

Den fundamentale SI-enhed for aktivitet er becquerel (Bq):<br />

1 Bq 1 disintegration pr. pr sekund<br />

Tidligere anvendtes den gamle enhed curie (Ci):<br />

1 Ci = 3 70001010 1 Ci = 3.700010 Bq = 37 0 GBq<br />

10 Bq = 37.0 GBq<br />

1 mCi = 37.0 MBq<br />

1 Bq = 2.702710-11 Ci = 27.0 pCi<br />

1 MBq = 27 27.0 0 Ci Ci<br />

2013 Isotopteknik, F04 (JG) 17

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