Statistical modeling of pulse height spectrum of gamma-ray spectrometers limited by incomplete charge collection

1999 ◽  
Vol 75 (2) ◽  
pp. 298-300 ◽  
Author(s):  
Y. Nemirovsky
Keyword(s):  
Statistical Modeling ◽  
Gamma Ray ◽  
Pulse Height ◽  
Charge Collection ◽  
Pulse Height Spectrum

Recent Progress of Transparent Ceramic Scintillators

2016 ◽  
Vol 98 ◽  
pp. 44-53 ◽  
Author(s):  
Takayuki Yanagida
Keyword(s):  
Recent Progress ◽  
Gamma Ray ◽  
Pulse Height ◽  
Light Yield ◽  
Emission Spectra ◽  
Ceramic Materials ◽  
Transparent Ceramic ◽  
Pulse Height Spectrum ◽  
Complex Perovskite ◽  
Decay Times

Recent progress of transparent ceramic scintillators is reviewed. The present work reports the research and development of oxide transparent ceramic materials such as garnet, sesquioxide, complex perovskite and some other kinds. Some representative scintillation properties such as scintillation emission spectra and decay times under X-ray irradiation are presented. Gamma-ray induced scintillation detector properties including pulse height spectrum, energy resolution, and light yield nonproportionality are also shown.

Simulated and Associated Experimental Results of CdZnTe Radiation Detector Response for Gamma-Ray Imaging Applications

1997 ◽  
Vol 487 ◽  
Author(s):  
L. Verger ◽  
J. P. Bonnefoy ◽  
A. Gliere ◽  
P. Ouvrier-Buffet ◽  
M. Rosaz
Keyword(s):  
Electric Field ◽  
Gamma Ray ◽  
Radiation Detector ◽  
Pulse Height ◽  
Correction Method ◽  
Experimental Results ◽  
Charge Collection ◽  
Detector Response ◽  
Pulse Correction ◽  
Fast Pulse

AbstractSimulated and associated experimental results of a high efficiency CdZnTe (CZT) radiation detector response for gamma-ray imaging applications are presented. The model of a high efficiency semiconductor gamma ray detector takes into account several different physical phenomena involved in the detection and correction processes, namely the geometry of the irradiation, the gamma-ray's interaction with the crystal, the physics of the semiconductor's charge collection, the electric field distribution and the pulse height correction method. A few important decoupling assumptions allow us to use a one dimensional charge collection simulation with a two-dimensional field model and a full three dimensional Monte-Carlo calculation of the gamma ray interactions. The model allows calculation of charge collection and gamma ray spectra for non uniform electric field distribution in either planar, striped or pixellated detector.The model takes also into account the new CZT fast pulse correction method and its associated noise by considering the pulse height and the rise time of electron signals (Bi-Parametric spectrum) for all gamma ray interactions. Specific simulated and experimental spectra at 122 keV are presented for CZT. First, basic spectral changes are calculated for variations in crystal and detector properties like mobility, trapping lifetime and electric field profilesSecond, new experimental results of the fast pulse correction method applied to different CZT detector grades are presented. This method allows to achieve a high detection efficiency (> 80 %) with a good energy resolution (< 6 % FWHM) at 122 keV for a 4×4×6 mm3 CZT detector. No specific contact geometry is needed and the unusual low applied bias voltage allows to limit the ageing and break voltage effects and also the dark current and its associated noise. This fast correction method is expected to be useful for medical imaging and other applications.Finally, simulated Bi-Parametric (BP) spectra expected with the fast pulse correction method according to the detector properties (electric field profiles, electron lifetime) are simulated and a qualitative comparison is provided.

Feasibility Study on the Nuclide Analysis of the Radwaste Drum Using the Spectrum to Dose Conversion Factor

2010 ◽  
Author(s):  
Young-Yong Ji ◽  
Dae-Seok Hong ◽  
Tae-Kuk Kim ◽  
Woo-Seog Ryu
Keyword(s):  
Dose Rate ◽  
Gamma Ray ◽  
Conversion Factor ◽  
Pulse Height ◽  
Assay Method ◽  
Pulse Height Spectrum ◽  
Detection Mechanism ◽  
Rate Information ◽  
Gamma Ray Detector ◽  
High Uncertainty

Estimating the radioisotope inventory of a drum based on the measured dose rate information, which is called as the dose to curie (DTC) conversion [1–3], has been known that there could be extremely high uncertainty associated with establishing the radioactivity of gamma emitters in a drum. However, the DTC method is still an effective assay method to calculate the radioisotope inventory because of their simple and easy procedures to be applied. To make the DTC method practical, numerous assumptions have to be made and limitations placed on its use. These assumptions and limitations were related to the dose rate measurement and the relative abundance of gamma emitters in a drum. These two variables were generally obtained from the different detection mechanism. Unfortunately, that expanded the limitation of using the DTC method. The spectrum to dose (STD) conversion factor [4,5] that was calculated from the measure pulse height spectrum of the gamma ray detector could be made obtaining two variables from the drum to be assayed at once. This method could be made estimating the radioisotope inventory of a drum more practical.

Gamma-ray pulse height spectrum of241Am-Be source by ‘Li-BC501 (n-γ) spectrometer system

1997 ◽  
Vol 215 (2) ◽  
pp. 257-261 ◽  
Author(s):  
Wuon-Shik Kim ◽  
Hyeon-Soo Kim ◽  
Ki-Hwan Kim ◽  
Yong-Uhn Kim ◽  
Ki-Hyon Kim
Keyword(s):  
Gamma Ray ◽  
Pulse Height ◽  
Pulse Height Spectrum ◽  
Γ Spectrometer ◽  
Spectrometer System
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