High Definition X-Ray Fluorescence: Principles and Techniques

Table 4

Reference and measured values for three polyethylene standards. The experimental uncertainty (at 95% level) includes estimated systematic uncertainty plus Poisson counting statistical uncertainty.

		Cr	Hg	Pb	Br	Uncertainty
PE_5398_N	Ref.	1001	1000	1000	500	4% (95% level)
	Mea.	1020	950	981	442	10% (95% level)
PE_H_18A	Ref.	1000	1100	1200	1100	4% (95% level)
	Mea.	1020	1150	1220	1090	10% (95% level)
PE_L	Ref.	400	200	400	500	4% (95% level)
	Mea.	401	185	419	508	10% (95% level)