IODP SEDIS - Thesaurus -

Pb-204
BT	isotopes
	.radioactive isotopes
	..Pb-204
BT	metals
	.lead
	..Pb-204
RT	Pb-206/Pb-204
	U-238/Pb-204
	Pb-207/Pb-204
	Pb-208/Pb-204
SN	This term has multiple hierarchies.

Pb-204/Pb-206
USE	Pb-206/Pb-204

Pb-204/Pb-208
USE	Pb-208/Pb-204