IODP SEDIS - Thesaurus -

U-238/Pb-204
BT	isotopes
	.radioactive isotopes
	..U-238/Pb-204
BT	metals
	.lead
	..U-238/Pb-204
BT	metals
	.actinides
	..uranium
	...U-238/Pb-204
RT	HIMU
	Pb-204
	U-238
SN	For isotopic ratio used in age determination, use U/Pb. This term has multiple hierarchies.