Thermoluminescence glow curve deconvolution and trapping parameters determination of dysprosium doped magnesium borate glass

2018 ◽  
Vol 148 ◽  
pp. 95-99 ◽  
Author(s):  
E. Salama ◽  
H.A. Soliman
Keyword(s):  
Glow Curve ◽  
Borate Glass ◽  
Magnesium Borate ◽  
Thermoluminescence Glow Curve

scholarly journals Effect of strontium concentration on thermoluminescence glow curve of copper doped lithium magnesium borate glass

2017 ◽  
Vol 13 (3) ◽  
Author(s):  
Nurul Anati Salleh ◽  
Abdul Rahman Tamuri ◽  
Mohamad Alam Saeed
Keyword(s):  
Glow Curve ◽  
Borate Glass ◽  
Amorphous State ◽  
X Ray Diffraction ◽  
Melt Quenching ◽  
Magnesium Borate ◽  
X Ray ◽  
Annealing Procedure ◽  
Thermoluminescence Glow Curve ◽  
Co Doped

This study investigates the thermoluminescence (TL) properties of copper (Cu2O) doped lithium magnesium borate (LMB) glass co-doped with strontium (SrO) subjected to Co-60 gamma irradiation. The glass samples based on (69.95-x)B2O3 – 20Li2O – 10MgO: 0.05Cu2O; xSrO, where 0.001 ≤ x ≤ 0.03 mol% were prepared by melt-quenching technique. The amorphous state of both Sr co-doped and Cu-doped LMB glass samples were confirmed by using X-Ray Diffraction (XRD). For this study, the optimum TL Response was found with 0.003 mol% of Sr concentration with TL intensity 3.6 x 105 nCg-1. The maximum peak temperature of glow curve for all glass samples was observed at 170-200 oC. The annealing procedure for the studied samples was determined at 100 oC for 20 minutes with the heating rate of 7 oC s-1.

Determination of the Provenience of Majolica Pottery Found in the Caribbean Area Using Its Gamma-Ray Induced Thermoluminescence

1975 ◽  
Vol 40 (1) ◽  
pp. 71-82 ◽  
Author(s):  
J. Eduardo Vaz ◽  
José M. Cruxent
Keyword(s):  
Glow Curve ◽  
Gamma Ray ◽  
Unknown Origin ◽  
Caribbean Area ◽  
Clay Matrix ◽  
The Caribbean ◽  
Thermoluminescence Glow Curve

The gamma-ray induced thermoluminescence of specimens of majolica pottery of known origin, and of specimens of majolica of unknown origin collected in the Caribbean area was analyzed to determine if thermoluminescence could be used as an indicator of the provenience of pottery found in an archaeological context. The results of the measurements show that the shape of the gamma-ray induced thermoluminescence glow-curve of the clay matrix of majolica is specific to the geographic locality where the pottery was made, and that the provenience of specimens found archaeologically can be determined on the basis of their thermoluminescence glow-curves, when the curves obtained from the samples with known origins are used as references.

An Overview on Peak Shape Method for Thermoluminescence Glow Curve Analysis

2018 ◽  
pp. 26-52
Author(s):  
Sukhamoy Bhattacharyya ◽  
Partha Sarathi Majumdar
Keyword(s):  
Activation Energy ◽  
Glow Curve ◽  
Frequency Factor ◽  
Curve Analysis ◽  
Peak Shape ◽  
Order Of Kinetics ◽  
Symmetry Factor ◽  
Alternative Approach ◽  
General Order ◽  
Thermoluminescence Glow Curve

The shape of a thermoluminescence (TL) glow curve has fundamental importance for calculating the characteristic parameters of trap levels within the band gap. TL analysis are mostly based on the three-parameter general order kinetics model. The parameters are activation energy, order of kinetics, and frequency factor. Peak shape method is one of the most prominent methods for extracting the activation energy from a TL curve. An overview of different peak shape methods along with an alternative approach formulated directly from basic TL equations is presented in this chapter. Generally, peak shape method requires prior knowledge of order of kinetics to determine activation energy which creates a difficulty due to the non-uniqueness of symmetry factor for a particular value of order of kinetics. A modified version of peak shape method which is free from this constraint is discussed here. Activation energies from experimental curves of tremolite and actinolite are estimated using peak shape method. Limitation of peak shape method for saturated TL peaks with heavy retrapping is also discussed.

MACHINE LEARNING ALGORITHMS FOR IDENTIFICATION OF ABNORMAL GLOW CURVES AND ASSOCIATED ABNORMALITY IN CaSO4:DY-BASED PERSONNEL MONITORING DOSIMETERS

2020 ◽  
Vol 190 (3) ◽  
pp. 342-351
Author(s):  
Munir S Pathan ◽  
S M Pradhan ◽  
T Palani Selvam
Keyword(s):  
Machine Learning ◽  
Glow Curve ◽  
Good Accuracy ◽  
Machine Learning Algorithms ◽  
Support Vector ◽  
Computationally Efficient ◽  
Artificial Neural Network Ann ◽  
First Time

Abstract In the present study, machine learning (ML) methods for the identification of abnormal glow curves (GC) of CaSO4:Dy-based thermoluminescence dosimeters in individual monitoring are presented. The classifier algorithms, random forest (RF), artificial neural network (ANN) and support vector machine (SVM) are employed for identifying not only the abnormal glow curve but also the type of abnormality. For the first time, the simplest and computationally efficient algorithm based on RF is presented for GC classifications. About 4000 GCs are used for the training and validation of ML algorithms. The performance of all algorithms is compared by using various parameters. Results show a fairly good accuracy of 99.05% for the classification of GCs by RF algorithm. Whereas 96.7% and 96.1% accuracy is achieved using ANN and SVM, respectively. The RF-based classifier is recommended for GC classification as well as in assisting the fault determination of the TLD reader system.

Impact of Nd3+ ions on physical and optical properties of Lithium Magnesium Borate glass

2014 ◽  
Vol 37 ◽  
pp. 391-397 ◽  
Author(s):  
M.H.A. Mhareb ◽  
S. Hashim ◽  
S.K. Ghoshal ◽  
Y.S.M. Alajerami ◽  
M.A. Saleh ◽  
...  
Keyword(s):  
Optical Properties ◽  
Borate Glass ◽  
Magnesium Borate

Thermoluminescence Techniques in Determination of the Stress and Crystallization History of Ice

1963 ◽  
Vol 4 (34) ◽  
pp. 453-460
Author(s):  
E. J. Zeller ◽  
L. B. Ronca
Keyword(s):  
Air Temperature ◽  
Glow Curve ◽  
General Nature ◽  
Curve Shape ◽  
Shearing Stress ◽  
Sample Container ◽  
Ice Cap ◽  
History Of ◽  
High Shearing

AbstractA series of glow-curve measurements were made to determine the general nature of the thermoluminescence of natural ice. The curves were made by subjecting the samples to ultraviolet radiation from a quartz-envelope mercury arc lamp while keeping the samples at liquid air temperature. The samples were then heated by passing a stream of air over the sample container. The resultant rise in temperature is non-linear but is nearly uniform from run to run. The light emitted was measured by the microphotometric portion of the standard apparatus for determination of mineral thermoluminescence.Curves were obtained on samples collected from the ice tunnel in the ice cap at Jungfraujoch and from freshly fallen and old snow at Bern in Switzerland. A systematic variation in glow-curve shape was found. This variation appears to be directly related to the stress history of the ice. Ice which has been subjected to high shearing stress can he readily distinguished from ice which has not.

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