I have to try that tonight. The potassium, I suppose?

K40? shrug

Lange's Handbook of Chemistry 1967:
Abundance % .0119
1.3x10^9 years beta-1.33;K;gamma1.46

Report back, please.

Dave "What, doesn't _everyone_ have a Geiger counter at home?" Hinz

LOL!

Alvin in AZ