Conversion of LiF-based thermoluminescent dosimeters into photoluminescent dosimeters via Dy doping. (6th October 2017)

• Record Type: Journal Article
• Authors: Ahmad, Habib; Ali, Shahid; Roomi, Sohail; Iqbal, Yaseen; Ajmal, Muhammad; Hayat, Khizar; Zulfiqar, Syed
• Is Part Of: Materials research express. Volume 4:Number 10(2017)
• Publication Date: 2017-10-06
• Subjects: nanophosphors -- thermoluminescence -- photoluminescence -- dosimeters -- radiation measurement; Materials science -- Research -- Periodicals; Materials science -- Periodicals; 620.11
• DOI: 10.1088/2053-1591/aa8ebf
• Languages: English
• ISSNs: 2053-1591

Abstract

Abstract: Mg- and Dy co-doped LiF nanophosphors were fabricated using a chemical co-precipitation method and characterized for their application potential as thermoluminescent (TL) and photoluminescent (PL) dosimeters. X-ray diffraction revealed the formation of almost single phase cubic LiF:Mg, Dy with an average crystallite size of ~35 nm. The TL glow curve consisted of a single peak in the temperature range 130–162 °C for different doses. The linearity and fading of these dosimeters were tested for 2 to 415 h. For these dosimeters, the minimum detectable dose was 40 mSv while the maximum detectable dose was ⩾10 000 mSv. The PL emission peaks occurred at 687 nm (red emission) and their intensity increased with increasing Dy 3+ concentration. Furthermore, the observed transfer of energy from Mg to Dy demonstrated that the excitation spectra of these nanophosphors could be controlled, suggesting the possibility of conversion of TL into PL dosimeters.