研究目的
To characterize and study the thermoluminescence behavior of beta-irradiated NaBaBO3 phosphor synthesized by the combustion method, focusing on its structural properties, dose response, heating rate effects, and kinetic parameters for potential dosimetric applications.
研究成果
NaBaBO3 phosphor was successfully synthesized via the combustion method and characterized as monoclinic. It exhibits thermoluminescence with a glow peak around 175 °C, showing linear dose response and second-order kinetics. Kinetic parameters were determined using peak shape and deconvolution methods, revealing an average activation energy of 1.31 eV. The study provides foundational knowledge on the intrinsic traps in NaBaBO3, suggesting potential for dosimetric applications, with recommendations for future work on doped samples to enhance understanding.
研究不足
The study is limited to pure NaBaBO3 without dopants; the influence of rare earth elements was not investigated. The TL glow curves may consist of overlapping peaks, requiring deconvolution for accurate analysis. The dose response linearity is not maintained at very low doses (e.g., 0.1 Gy). The synthesis method may introduce impurities if not optimized, as seen with initial sintering at 900 °C without calcination.
1：Experimental Design and Method Selection:
The combustion method was used for synthesis, with sintering temperatures varied from 600 to 1000 °C to optimize material performance. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were employed for structural and morphological analysis. Thermoluminescence (TL) measurements were conducted using a TL/OSL reader to study glow curves, dose response, and heating rate effects. Kinetic parameters were analyzed using the peak shape method and TLanal software.
2：Sample Selection and Data Sources:
Samples were synthesized from starting materials including NaNO3, Ba(NO3)2, H3BO3, NH4NO3, and CO(NH2)2. Pellets of approximately 25 mg were used for TL measurements. Data were collected from XRD patterns, SEM images, and TL glow curves.
3：Pellets of approximately 25 mg were used for TL measurements. Data were collected from XRD patterns, SEM images, and TL glow curves.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment includes a Philips PW-1710 XRD, FEI Quanta 650 SEM, and Lexsyg Smart TL/OSL reader with a Hamamatsu bi-alkaline PMT and a 90Sr/90Y beta source. Materials include NaNO3 (Aldrich, 99.9%), Ba(NO3)2 (99.9%), H3BO3 (99.9%), NH4NO3 (99.9%), CO(NH2)2 (99.9%), and alumina crucibles.
4：9%), Ba(NO3)2 (9%), H3BO3 (9%), NH4NO3 (9%), CO(NH2)2 (9%), and alumina crucibles.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Reactants were weighed, mixed, and ground in an agate mortar, then sintered in a furnace at specified temperatures. After sintering, pellets were formed. XRD and SEM analyses were performed. For TL, samples were irradiated with beta doses from 0.115 to 55.2 Gy, preheated at 130 °C, and glow curves were recorded at heating rates from 0.5 to 20 °C/s using a 565 nm filter.
5：115 to 2 Gy, preheated at 130 °C, and glow curves were recorded at heating rates from 5 to 20 °C/s using a 565 nm filter.
Data Analysis Methods:
5. Data Analysis Methods: XRD data were compared with JCPDS standards. TL glow curves were analyzed using Chen's peak shape method and deconvoluted with TLanal software to determine kinetic parameters such as activation energy and frequency factor.
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