https://www.erowid.org/references/refs_view.php?ID=7088&S=hill
Erowid.org: Erowid Reference 7088 : Lead-210 and polonium-210 in grass : Hill CR
The Index page for the reference article: Hill CR Lead-210 and polonium-210 in grass Nature 1960 187:211-2
erowid orglead 210