[Elecraft] K3 External Frequency Reference Questions

[Ian White]

A rubidium frequency source contains a few milligrams of natural
rubidium, some of which is weakly radioactive.

But there is about 5 times more radioactivity in a banana and about 1000
times more natural radioactivity in the human body itself (in both
cases, mostly due to natural potassium-40). 

Guess which of those three requires the hazmat sheet?


73 from Ian GM3SEK