360 / 1840
Previously, source strength specification was based on
“contents”, # of disintegrations per time unit
The “Strength” of a Source
By Definition: 1 Ci (3.7 x 10
10
s
-1
) Activity of 1 g Ra-226
In SI-units: 1 Disintegration per s = 1 Bq
(mostly using a prefix: MBq, GBq)
Example: 1 mCi = 37 MBq