Table 1. Spin–lattice relaxation rate (1/T₁) of 1 mL γ-Fe₂O₃@Au aqueous solution with and without light irradiation.

1/T1 (s−1)
Iron concentration (mM)	0.21	0.14	0.095	0.048	0.021	0.0021
Light OFF	2.372 ± 0.071	1.631 ± 0.045	1.320 ± 0.027	1.003 ± 0.036	0.758 ± 0.014	0.444 ± 0.013
Light On	2.651 ± 0.050	1.835 ± 0.051	1.447 ± 0.019	1.090 ± 0.020	0.734 ± 0.017	0.444 ± 0.014
P-value	0.0016	0.0032	0.0005	0.0379	0.1693	0.4950

The data are presented as the mean ± SEM from 10 measurements. The P-value is based on single-trail paired t-test calculation.