Table 2. Curve Fitting Results of XPS C 1s Spectra.

	peak	position (eV)	FWHM (eV)	%
PE	carbide C	283.30	1.91	40.5
	C–C	284.95	1.47	56.2
	C–O	286.30	2.72	2.88
	C=O	287.36	1.00	0.00
	COOH	288.70	1.97	0.45
PO4/PE	carbide C	283.30	2.08	34.2
	C–C	284.92	1.67	64.6
	C–O	286.10	1.00	0.00
	C=O	287.40	1.21	0.81
	COOH	288.70	1.05	0.36
U-laden PO4/PE	carbide C	283.30	1.03	0.74
	C–C	284.82	1.36	83.5
	C–O	286.10	1.16	11.03
	C=O	287.38	1.58	4.22
	COOH	288.70	2.04	0.54