Formation and characterization of ultrafine nanophosphors of lithium tetraborate (Li2B4O7) for personnel and medical dosimetry

• Main Authors: Nasrin Khalilzadeh, Elias Bin Saion, Hamed Mirabolghasemi, Nayereh Soltani, Abdul Halim Bin Shaari, Mansor Bin Hashim, Noriah Mod Ali, Arash Dehzangi
• Format: Article
• Language: English
• Published: Elsevier 2016-07-01
• Series: Journal of Materials Research and Technology
• Subjects: Nanophosphors; Thermal treatment; Dosimeter; Thermoluminescence; Energy dependence
• Online Access: http://www.sciencedirect.com/science/article/pii/S2238785415001118
• ISSN: 2238-7854

The present study demonstrates an innovative single-step thermal synthesis of nano-sized lithium tetraborate dosimeter and its characterization. The optimum calcination temperature and time for the synthesis of the nanoparticles material was 750 °C and 2 h, respectively. Characterization of the samples was carried out using X-ray diffractometry (XRD), Fourier transform infrared (FT-IR) spectroscopy, transmission electron microscopy (TEM), and thermoluminescence (TL). FT-IR, XRD and TEM results confirmed the formation of pure nano-crystalline lithium tetraborate. The product showed a linear response over a wide range of doses from 10−1 to 1.5 × 102 Gy. Moreover, the samples illustrate non-energy dependence among a wide range energy interval from 24 keV up to 1250 keV and almost no fading during one month storage.