Measurement of absolute light yield and quantum efficiency of LaBr3:Ce scintillator detector using SiPM

2021 ◽  
Vol 16 (12) ◽  
pp. P12024
Author(s):  
R. Sariyal ◽  
I. Mazumdar ◽  
S.M. Patel
Keyword(s):  
Quantum Efficiency ◽  
Measurement Method ◽  
Light Yield ◽  
Comparison Method ◽  
Scintillation Detectors ◽  
Photo Detectors ◽  
The Absolute ◽  
Scintillator Detector ◽  
Good Agreement

Abstract This brief communication presents our work to determine the absolute light yield and quantum efficiency of LaBr3:Ce scintillator by comparison and also by direct pulse measurement method using SiPM. The first part presents use of the simpler comparison method to determine the light yields of different scintillators using the known yield of NaI(Tl) as reference. In the second part we have determined the absolute light yield and quantum efficiency of LaBr3:Ce crystal by using a SiPM photo detector. Our measured value is in good agreement with the light yield reported by previous measurements using PMT and excitation fluorescence spectroscopy. Quantum efficiencies for scintillation detectors have been determined by using both PMTs and photo detectors, namely APDs by previous authors. This communication is possibly the first report on the determination of quantum efficiency of LaBr3:Ce using SiPM photo detector. The simple and effective method presented here would allow to determine the light yield of any scintillation detector.

scholarly journals Determination of the absolute hardness of electrolytically produced copper coatings by application of the Chicot-Lesage composite hardness model

2021 ◽  
pp. 105-105
Author(s):  
Ivana Mladenovic ◽  
Jelena Lamovec ◽  
Dana Vasiljevic-Radovic ◽  
Vesna Radojevic ◽  
Nebojsa Nikolic
Keyword(s):  
Pause Duration ◽  
Atomic Force ◽  
Copper Coatings ◽  
The Absolute ◽  
Hardness Model ◽  
Composite Hardness ◽  
Pulsating Current ◽  
Good Agreement ◽  
Coating Hardness

In this study, a novel procedure based on application of the Chicot?Lesage (C?L) composite hardness model was proposed for determination of an absolute hardness of electrolytically produced copper coatings. The Cu coatings were electrodeposited on the Si(111) substrate by the pulsating current (PC) regime with a variation of the following parameters: the pause duration, the current density amplitude and the coating thickness. The topography of produced coatings was characterized by atomic force microscope (AFM), while a hardness of the coatings was examined by Vickers microindentation test. Applying the C?L model, the critical relative indentation depth (RID)c of 0.14 was determined, which is independent of all examined parameters of the PC regime. This RID value separated the area in which the composite hardness of the Cu coating corresponded to its absolute hardness (RID < 0.14) from the area in which application of the C?L model was necessary for a determination of the absolute coating hardness (RID ? 0.14). The obtained value was in a good agreement with the value already published in the literature.

scholarly journals Determination of the absolute internal quantum efficiency of photoluminescence in GaN co-doped with Si and Zn

2012 ◽  
Vol 111 (7) ◽  
pp. 073106 ◽  
Author(s):  
M. A. Reshchikov ◽  
M. Foussekis ◽  
J. D. McNamara ◽  
A. Behrends ◽  
A. Bakin ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
Internal Quantum Efficiency ◽  
The Absolute ◽  
Co Doped

scholarly journals Kinetic and Conventional Spectrophotometric Determination of Bumadizone in its Tablets via Oxidative Coupling with 3-Methyl-2-Benzothiazolinone Hydrazone

2009 ◽  
Vol 5 (3) ◽  
pp. 839-854
Author(s):  
Mohamed Walash ◽  
Fathalla Belal ◽  
Manar Tolba ◽  
Mohamed Halawa
Keyword(s):  
Oxidative Coupling ◽  
Coupling Reaction ◽  
Comparison Method ◽  
Spectrophotometric Methods ◽  
Oxidative Coupling Reaction ◽  
Bulk Drug ◽  
Kinetic Spectrophotometric ◽  
Chloride Method ◽  
Good Agreement

Two simple, sensitive and accurate spectrophotometric methods have been developed for the determination of bumadizone in bulk drug and its tablets. Both methods based on the oxidative coupling reaction with 3-methyl-2-benzothiazolinone hydrazone hydrochloride (MBTH) and measuring the absorbance of the developed colors by direct or kinetic spectrophotometric method. Upon treatment of a mixture of the chromogenic reagent and drug with cerium (IV) ammonium sulfate (method I) or ferric chloride (method I), a red or violet color was developed immediately or after 30 minutes measurable at 557 nm for method I or II, respectively. The absorbance-concentration plots were rectilinear over the ranges of 1-10 μg/mL (r = 0.9999) for method I and 2-16 μg/mL (r = 0.9998) for method II. The detection limits were  0.15 and 0.27 μg/mL & the quantitation limits were 0.46 and 0.84 μg/mL for methods I and II, respectively. Different experimental parameters affecting the development and stability of the reactions products were studied and optimized. The proposed methods were applied successfully to the determination of bumadizone in its tablets, and the results obtained were in good agreement with those obtained using a comparison  method. 

scholarly journals Intercomparison of erythemal broadband radiometers calibrated by seven UV calibration facilities in Europe and the USA

2008 ◽  
Vol 8 (1) ◽  
pp. 2249-2273
Author(s):  
G. Hülsen ◽  
J. Gröbner ◽  
A. Bais ◽  
M. Blumthaler ◽  
P. Disterhoft ◽  
...  
Keyword(s):  
Absolute Calibration ◽  
Angular Response ◽  
The Usa ◽  
Combined Uncertainty ◽  
The Absolute ◽  
Spectral Responses ◽  
Good Agreement

Abstract. A bi-lateral intercomparison of erythemal broadband radiometers was performed between seven UV calibration facilities. The owners calibrations were compared relative to the characterisation and calibration performed at PMOD/WRC in Davos, Switzerland. The calibration consisted in the determination of the spectral and angular response of the radiometer, followed by an absolute calibration performed outdoors relative to a spectroradiometer which provided the absolute reference. The characterization of the detectors in the respective laboratories are in good agreement: The determination of the angular responses have deviations below ±4% and the spectral responses agree within ±20%. A "blind" intercomparison of the erythemally weighted irradiances derived by the respective institutes and PMOD/WRC showed consistent measurements to within ±2% for the majority of institutes. One institute showed slightly larger deviation of 10%. The differences found between the different instrument calibrations are all within the combined uncertainty of the calibration.

scholarly journals Intercomparison of erythemal broadband radiometers calibrated by seven UV calibration facilities in Europe and the USA

2008 ◽  
Vol 8 (16) ◽  
pp. 4865-4875 ◽  
Author(s):  
G. Hülsen ◽  
J. Gröbner ◽  
A. Bais ◽  
M. Blumthaler ◽  
P. Disterhoft ◽  
...  
Keyword(s):  
Absolute Calibration ◽  
Angular Response ◽  
The Usa ◽  
Combined Uncertainty ◽  
The Absolute ◽  
Spectral Responses ◽  
Good Agreement

Abstract. A bi-lateral intercomparison of erythemal broadband radiometers was performed between seven UV calibration facilities. The calibrations provided by the instruments owners were compared relative to the characterisation and calibration performed at PMOD/WRC in Davos, Switzerland. The calibration consisted in the determination of the spectral and angular response of the radiometer, followed by an absolute calibration performed outdoors relative to a spectroradiometer which provided the absolute reference. The characterization of the detectors in the respective laboratories are in good agreement: The determinations of the angular responses have deviations below ±4% and the spectral responses agree within ±20%. A "blind" intercomparison of the erythemally weighted irradiances derived by the respective institutes and PMOD/WRC showed consistent measurements to within ±2% for the majority of institutes. One institute showed slightly larger deviation of 10%. The differences found between the different instrument calibrations are all within the combined uncertainty of the calibration.

scholarly journals Determination of Absolute Proper Motions by Use of Automated Measurements of Tautenburg Plates

1990 ◽  
Vol 141 ◽  
pp. 451-452
Author(s):  
R.-D. Scholz
Keyword(s):  
Globular Cluster ◽  
Proper Motion ◽  
Proper Motions ◽  
Automated Measurements ◽  
The Absolute ◽  
Good Agreement

From measurements of Tautenburg Schmidt plates with the APM in Cambridge positional accuracies per plate of 0.″05 for stars and of 0.″10 for galaxies were achieved. With 0.″3/100a accuracy in a single stellar proper motion we obtained the absolute proper motion of the M3 globular cluster in good agreement between the two pairs of plates used.

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