Table 2.

Raman D and G peak intensity of carbon-based materials found by several research groups.

Authors	Carbon materials	Dose (Gy)	${\mathrm{E}}_{\mathrm{laser}}$ (eV)	${\mathrm{I}}_{\mathrm{D}}{(cm}^{-1}$)	${\mathrm{I}}_{\mathrm{G}}{(cm}^{-1}$)
Abdul Sani et al.14	Pencils H and 9B	0–20	2.41	$\sim$ 1348	$\sim$ 1578
Bradley et al.10	Mechanical pencil lead 2B & 8H	10	2.33	$\sim$ 1343	$\sim$ 1570
Pramanick et al.31	Pyrolyzed human hair	0	2.41	$\sim$ 1366	$\sim$ 1586
Qian et al.35	Pyrolyzed human hair	0	Not available	$\sim$ 1320	$\sim$ 1590
Huang et al.36	Human hair	0	1.58 and 1.96	$\sim$ 1375	$\sim$ 1580