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Dosimeter based on silver-nanoparticle precursors for medical applications with linear response over a wide dynamic range

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5 Author(s)
Funaro, M. ; Dept. of Chem. & Biol., Salerno Univ., Fisciano, Italy ; Di Bartolomeo, A. ; Pelosi, P. ; Saponetti, M.S.
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In this Letter the authors study a liquid detector based on Ag nanoparticles for dosimetry purposes. They use two different concentrations of silver nitrate (1 mM AgNO3) and sodium citrate (1 and 0.1% C6H5O7Na3) as precursors for the formation of Ag nanoparticles in an aqueous colloidal solution. The authors utilise a linear accelerator to expose the solutions to absorbed doses ranging from 0.5 to 120 Gy and they find that gamma radiation induces the synthesis of Ag nanoparticles already at 2 Gy, when the sodium citrate concentration is lowered to 0.1 . The authors find a correlation between shape/dimension of the Ag nanoparticles and the absorbed dose. More importantly, the authors show that the absorbance peak intensity of the Ag nanoparticles increases with the absorbed dose and that a linear dependence is achieved at the lower sodium citrate concentration.

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Micro & Nano Letters, IET  (Volume:6 ,  Issue: 9 )