Four grams of natural lutetium metal
This lutetium is naturally occurring and therefore has a Lu-176 abundance of 2.59%, making it weakly radioactive.
The Radiacode 103 measurement in the third picture was taken in a background of 250CPM.
Excellent calibration source for the Radiacode, Atom Fast, and gamma spectroscopy
Coin and Radiacode Not Included
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