Abstract
We have reported the influence of annealing temperature and heating rate on thermoluminescence (TL) properties of nanocrystalline calcium borate, CaB 2 O 4 , powder synthesized by solution combustion method. Powder X-ray diffraction experiments were carried out on CaB 2 O 4 to get the crystal phase and size. The samples were annealed using the TLD oven and exposed to cobalt-60 source. TL glow curves were measured and recorded using a Harshaw model 3500 TLD reader. The crystal phase confirmed one major phase of CaB 2 O 4 with 27 nm in size. CaB 2 O 4 has a simple glow curve with only one and a well defined peak at around 150 C. TL intensity was higher after annealing the material before irradiation which indicated the importance of annealing. It was found that an annealing temperature at 300 C for one hour and the heating rate of 10 C s -1 was the best procedure to produce high TL intensity.
Highlights
Thermoluminescent (TL) dosimetry is used for radiation protection purposes and clinical uses such as for measuring absorbed dose to patient in diagnostic radiology and radiotherapy
As a member of a state of the International Atomic Energy Agency (IAEA), Malaysia has participated in a project called “IAEA/WHO Thermoluminesence Dosimeter (TLD) Postal Audit Program” [1]
The major crystalline phase of CaB2O4 is formed as the products of the nitridation reaction. This is in good agreement with the reference database from the Joint Committee on Powder Diffraction Standards (JCPDF) card number 75-0640
Summary
Thermoluminescent (TL) dosimetry is used for radiation protection purposes and clinical uses such as for measuring absorbed dose to patient in diagnostic radiology and radiotherapy. Challenges and requirements of thermoluminescent materials were low cost production and a simple glow curve structure which eliminates the need for complicated annealing regimes as TLD-100 has a complicated glow curve [3]. With these restrictions in mind and the increasing use of radiation in the processes associated with medical and industrial applications have motivated research on new materials with adequate dosimetric properties. CaB2O4 is one of the widely studied oxide materials because of its excellent structural and optical properties This compound with a bone effective atomic number (Zeff ~ 12.5) can be counted as a promising material for the future of personal and environmental applications [8]. The aim of the study was to determine the influence of annealing temperature and heating rate on TL properties based on nanocrystalline CaB2O4 powder prepared by solution combustion method
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