“Random people do not have access to polonium.”
Actually it was available over the counter at high end audio equipment stores in the 60’s and 70’s.
Static-Master anti-static anti-dust brushes contained minute quantities of polonium 210 and were used to brush off vinyl record albums.
I probably have one or two of my late dad’s of that era stored with his hi-fi accessories.
Still available on the internet. Unfortunately your stash is no more, half life of 138 days.