The present paper reports Thermoluminescence (TL) Glow curve of Mn2+ doped CaAl2O4 phosphor with different UV exposure time. The Glow peak shows general order kinetics and evaluation of kinetic parameters was done by ...The present paper reports Thermoluminescence (TL) Glow curve of Mn2+ doped CaAl2O4 phosphor with different UV exposure time. The Glow peak shows general order kinetics and evaluation of kinetic parameters was done by peak shape method. Calculations of Trap Depth were done with Chen’s different methods and order of kinetics, activation energy and frequency factor are calculated. The recorded glow curve shifts towards higher temperature with increasing intensity as a function of UV exposure time until 30 minutes where it is seen that the peak shifts towards low temperature side and intensity also decreases. The peaks were found at 345?C, 356.83?C, 358?C and 356.73?C respectively using the heating rate 6.7?C/s. The PL (photoluminescence) excitation spectra show peaks at 248 nm and 362 nm whereas emission spectra shows peaks between 364 nm and 551 nm. Sample was characterized by XRD technique.展开更多
This study presents the intercomparison of the outdoor environmental gamma dose rates measured using a Nal （TI） based survey meter along with thermoluminescent dosimeters （TLDs） and estimation of excess lifetime c...This study presents the intercomparison of the outdoor environmental gamma dose rates measured using a Nal （TI） based survey meter along with thermoluminescent dosimeters （TLDs） and estimation of excess lifetime cancer risk （ELCR）, for the inhabitants of Poonch division of the Azad Kashmir, Pakistan. CaF2： Dy （TLD-200） card dosimeters were installed at height of 1 m from ground at fifteen different locations covering the entire Poonch division comprising of three districts.展开更多
Sr3.96Al14025：Eu2＋,Dy3＋ long persistent materials with different weights of H3BO3 prepared by the high temper- ature solid-state reaction method were characterized by X-ray powder diffraction （XRD）, scanning elec...Sr3.96Al14025：Eu2＋,Dy3＋ long persistent materials with different weights of H3BO3 prepared by the high temper- ature solid-state reaction method were characterized by X-ray powder diffraction （XRD）, scanning electronic microscopy （SEM）, photoluminescence spectra （PL）, and thermoluminescence （TL）. The results of XRD indicate that the 3% addition of H3BO3 favorable for the formation of pure phase Sr4Al14025, and SrAl12O19 was generated when there is a low con- tent or high content of H3BO3. The average grain sizes of samples grow bigger with an increase of H3BO3. PL spectra show that the emission peak does not shift evidently and the emission intensity changes little, indicating that the different amount of H3BO3 has little influence on the crystal field. The decay characteristics and TL measurement show that H3BO3 affects the afterglow properties of Sr3.96Al14025：Eu2＋,Dy3＋, because the increasing H3BO3 leads to more defects in the Sr4Al14025 matrix.展开更多
文摘The present paper reports Thermoluminescence (TL) Glow curve of Mn2+ doped CaAl2O4 phosphor with different UV exposure time. The Glow peak shows general order kinetics and evaluation of kinetic parameters was done by peak shape method. Calculations of Trap Depth were done with Chen’s different methods and order of kinetics, activation energy and frequency factor are calculated. The recorded glow curve shifts towards higher temperature with increasing intensity as a function of UV exposure time until 30 minutes where it is seen that the peak shifts towards low temperature side and intensity also decreases. The peaks were found at 345?C, 356.83?C, 358?C and 356.73?C respectively using the heating rate 6.7?C/s. The PL (photoluminescence) excitation spectra show peaks at 248 nm and 362 nm whereas emission spectra shows peaks between 364 nm and 551 nm. Sample was characterized by XRD technique.
文摘This study presents the intercomparison of the outdoor environmental gamma dose rates measured using a Nal （TI） based survey meter along with thermoluminescent dosimeters （TLDs） and estimation of excess lifetime cancer risk （ELCR）, for the inhabitants of Poonch division of the Azad Kashmir, Pakistan. CaF2： Dy （TLD-200） card dosimeters were installed at height of 1 m from ground at fifteen different locations covering the entire Poonch division comprising of three districts.
基金Project supported by the National Natural Science Foundation of China (Grant Nos. 21271048, 11147152, and 61106124)the Natural Science Fund of Zhanjiang Normal University of China (Grant No. QL1020)
文摘Sr3.96Al14025：Eu2＋,Dy3＋ long persistent materials with different weights of H3BO3 prepared by the high temper- ature solid-state reaction method were characterized by X-ray powder diffraction （XRD）, scanning electronic microscopy （SEM）, photoluminescence spectra （PL）, and thermoluminescence （TL）. The results of XRD indicate that the 3% addition of H3BO3 favorable for the formation of pure phase Sr4Al14025, and SrAl12O19 was generated when there is a low con- tent or high content of H3BO3. The average grain sizes of samples grow bigger with an increase of H3BO3. PL spectra show that the emission peak does not shift evidently and the emission intensity changes little, indicating that the different amount of H3BO3 has little influence on the crystal field. The decay characteristics and TL measurement show that H3BO3 affects the afterglow properties of Sr3.96Al14025：Eu2＋,Dy3＋, because the increasing H3BO3 leads to more defects in the Sr4Al14025 matrix.
