Table T3. X-ray fluorescence operating conditions during XRF analyses.

Oxide or element						Background offset (°2)	Count time
	Line	Crystal	Detector	Collimator	Peak angle (°2)		Peak (s)	Background (s)
Major element (wt%)
SiO2	Ka	PET	FPC	Medium	109.21		40
TiO2	Ka	LIF200	FPC	Fine	86.14		40
Al2O3	Ka	PET	FPC	Medium	145.12		100
Fe2O3	Ka	LIF200	FPC	Fine	57.52		40
MnO	Ka	LIF200	FPC	Fine	62.97		100
MgO	Ka	TLAP	FPC	Medium	45.17	±0.80	150	150
CaO	Ka	LIF200	FPC	Medium	113.09		40
Na2O	Ka	TLAP	FPC	Medium	54.10	-1.20	150	150
K2O	Ka	LIF200	FPC	Medium	136.69		100
P2O5	Ka	GE111	FPC	Medium	141.04		100
Trace element (ppm)
Rh	Compton	LIF200	Scint		18.58		60
Nb	Ka	LIF200	Scint	Fine	21.40	+0.35	200	100
Zr	Ka	LIF200	Scint	Fine	22.55	-0.35	100	50
Y	Ka	LIF200	Scint	Fine	23.80	-0.40	100	50
Sr	Ka	LIF200	Scint	Fine	25.15	-0.40	100	50
Rb	Ka	LIF200	Scint	Fine	26.62	-0.60	100	50
Zn	Ka	LIF200	Scint	Medium	41.81	-0.55	100	50
Cu	Ka	LIF200	Scint	Fine	45.03	-0.55	100	50
Ni	Ka	LIF200	Scint	Medium	48.67	-0.60	100	50
Cr	Ka	LIF200	FPC	Fine	69.35	-0.50	100	50
V	Ka	LIF220	FPC	Fine	123.06	-0.50	100	50

Notes: All major elements measured using a rhodium X-ray tube operated at 30 kV and 80 mA. Trace elements are measured using a rhodium X-ray tube operated at 60 kV and 50 mA. FPC = flow-proportional counter (P10 gas); Scint = NaI Scintillation counter. This table is also available in ASCII format.