Simulation of MeV electron energy deposition in CdS quantum dots absorbed in silicate glass for radiation dosimetry

Abstract

We are currently developing 2D dosimeters with optical readout based on CdS or CdS/CdSe core-shell quantum-dots using commercially available materials. In order to understand the limitations on the measurement of a 2D radiation profile the 3D deposited energy profile of MeV energy electrons in CdS quantum-dot-doped silica glass have been studied by Monte Carlo simulation using the CASINO and PENELOPE codes. Profiles for silica glass and CdS quantum-dot-doped silica glass were then compared.

Radioluminescence properties of the CdSe/ZnS Quantum Dot nanocrystals with analysis of long-memory trends

“…10 clearly demonstrates that the investigated QD samples can detect the X-rays within the RMI energy range. This finding is in agreement with the work of other investigators (Del Sordo et al, 2009;Stodilka et al, 2009;Baharin et al, 2010;Hobson et al, 2011). It is important that this paper was the first one in which a variety of methods has been introduced and compared to understand the underlying mechanisms of the X-ray induced emission of the Lumidot QD system, focusing on the differences of their acquisition and detection ability.…”

“…Simultaneously, the novel designs need to be explored through a combination of modelling and experimentation. Noteworthy advances in this field of research include the construction of sensors of small size (Rodnyi, 2001;Michail et al, 2015a), nanophosphors Seferis et al, 2014Seferis et al, , 2015 and QDs (Zych et al, 2003;Kim et al, 2007;Konstantatos et al, 2007;Del Sordo et al, 2009;Rauch et al, 2009;Stodilka et al, 2009;Baharin et al, 2010;Malyukin, 2010;Hobson et al, 2011;Konstantatos and Sargent, 2011;Lawrence et al, 2012). QDs resemble particle size of the order of 1 nme20 nm (Goncharova et al, 2004).…”

“…QDs resemble particle size of the order of 1 nme20 nm (Goncharova et al, 2004). Due to their unique optical and electrical properties they have been already utilised in optoelectronic sensors (Guo et al, 2000;Eychmuller, 2000;Ma et al, 2003;Wang et al, 2006;Gbur et al, 2013), as radiation sensors (Del Sordo et al, 2009, Stodilka et al, 2009Baharin et al, 2010;Hobson et al, 2011;Nistor et al, 2013;Sahi and Chen, 2013) and theranostics in nuclear medicine (Assadi et al, 2011). Recent studies suggest also that QDs can be employed in optical diffusion applications of high sensitivity (e.g.…”

“…in nuclear medical imaging), nuclear physics to X-ray and gamma-ray astronomy (Pang et al, 2005;Voitenko et al, 2007;Del Sordo et al, 2009;Klassen et al, 2009;Xing et al, 2009), as well as in modalities where high light spatial resolution is required (e.g. in X-ray projection medical imaging) Jacobsohn et al, 2007;Del Sordo et al, 2009;Stodilka et al, 2009;Baharin et al, 2010;Hobson et al, 2011;Seferis et al, 2014Seferis et al, , 2015.…”

“…Nevertheless, despite the relevant scientific evidence, only some investigations have dealt with the application of QDs as ionising radiation sensors (Dai et al, 2002;Letant and Wang, 2006a, 2006b, Cevik et al, 2008Waheed et al, 2009;Lawrence et al, 2012;Sahi and Chen, 2013) and even less (Baharin et al, 2010;Hobson et al, 2011;Lawrence et al, 2012;Valais et al, 2015) for potential uses in RMI. In the above consensus, this paper has focused on the radiation detection properties of Cadmium Selenide/Zinc Sulfide (CdSe/ZnS) core-shell type QDs for potential technological applications in X-ray radiology and for radiation safety monitoring e.g.…”