Abstract
Reverse micelles (RMs) containing aqueous solutions of Ag ? ions in their core produce fluorescent Ag nanoclusters (NCs), upon exposure to gamma irradiation. The fluorescence spectra of the NCs evolve over days to weeks after the exposure, and usually show large increases in intensity. Responses of as high as 2.8 9 10 4 CPS/Gy were reached. A dosage as low as 0.5 Gy (10 % of the lethal dosage for humans) produces NCs having fluores- cence intensities higher than background. The RMs can be employed in novel gamma radiation detectors with appearance of fluorescence indicating that radiation was once present. In applications involving detection and tracking of fissile materials, the evolution of the fluores- cence spectra over time may provide additional informa- tion about the radiation source. A two-phase liquid system is used for RM formation in a simple procedure. It is likely that this synthesis method may be adapted to produce NCs from other metal ions.
Highlights
Metal nanoclusters (NCs) are at a length scale between atoms and nanoparticles and often have desirableIn a recent communication (Martin et al 2012), we described our work using silver ion-containing reverse micelles (RMs) to generate fluorescent silver NCs upon exposure to gamma irradiation
We are interested in exploring the use of the Reverse micelles (RMs) as detectors of gamma radiation emitted by fissile materials within the context of detection and tracking of radioactive isotopes used in weapons of mass destruction (WMD)
The copolymers used are of relatively low MW and have only two blocks, one composed of polyacrylic acid (PAA) and the second composed of polystyrene (PS)
Summary
In a recent communication (Martin et al 2012), we described our work using silver ion-containing reverse micelles (RMs) to generate fluorescent silver NCs upon exposure to gamma irradiation Is sequestered into the aqueous core of the RMs. Gamma-ray exposure causes the water molecules contained in the core to undergo bond scission reactions, yielding solvated electrons, hydrogen atoms, and hydroxyl radicals (Woods and Pikaev 1994). Gamma-ray exposure causes the water molecules contained in the core to undergo bond scission reactions, yielding solvated electrons, hydrogen atoms, and hydroxyl radicals (Woods and Pikaev 1994) This leads to rapid reduction of the Ag? We investigate how the RM emission spectra vary as a function of dosage (very low vs. high), and the manner in which the spectra evolve over extended time periods
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