ID/IG ratios by Raman spectra.

Samples	I D/IG
	Non-radiation	10 kGy	500 kGy	1500 kGy
GO	0.90	0.83	0.93	0.82
1 wt% GO/PVA	0.95	0.94	0.96	0.92
5 wt% GO/PVA	0.92	0.88	0.93	0.91