Role of gold nano-particle in chemical fricke dosimeter

In the present study, an attempt has been made to evaluate contribution of the Gold Nano-Particles (AuNPs) in standard Fricke chemical dosimetry solution during Gamma irradiation. Different concentrations of purified AuNPs were added to Fricke solution and absorbance was measured before and after exposing to graded doses of Gamma rays. Absorbance of un-irradiated Fricke solution with and without AuNPs was also measured and compared. Absorption spectra with peak at 303nm indicate no chemical reaction upon adding AuNPs in to Fricke solution. Further, peak observed around 555 nm clearly indicates the stability of the Nano-Particles (NPs) in Fricke solution. For a given dose, a significant increase observed in the optical intensity for Fricke solution with AuNPs, as compared to Fricke solution alone, confirms the effectiveness of AuNPs during irradiation. Study also indicates that concentration of AuNPs can also influence the absorbance significantly. (author)