scholarly journals An Optimized Design of Single-Channel Beta-Gamma Coincidence Phoswich Detector by Geant4 Monte Carlo Simulations

2011 ◽  
Vol 2011 ◽  
pp. 1-5 ◽  
Author(s):  
Weihua Zhang ◽  
Pawel Mekarski ◽  
Marc Bean ◽  
Jing Yi ◽  
Kurt Ungar
Keyword(s):  
Single Channel ◽  
Optimized Design ◽  
Measurement Sensitivity ◽  
Phoswich Detector ◽  
Beta Counting ◽  
Gamma Coincidence ◽  
Detector Geometry ◽  
Light Gathering ◽  
Well Detector ◽  
Counting Cell

An optimized single-channel phoswich well detector design has been proposed and assessed in order to improve beta-gamma coincidence measurement sensitivity of xenon radioisotopes. This newly designed phoswich well detector consists of a plastic beta counting cell (BC404) embedded in a CsI(Tl) crystal coupled to a photomultiplier tube. The BC404 is configured in a cylindrical pipe shape to minimise light collection deterioration. The CsI(Tl) crystal consists of a rectangular part and a semicylindrical scintillation part as a light reflector to increase light gathering. Compared with a PhosWatch detector, the final optimized detector geometry showed 15% improvement in the energy resolution of a131mXe 129.4 keV conversion electron peak. The predicted beta-gamma coincidence efficiencies of xenon radioisotopes have also been improved accordingly.

scholarly journals Standardisation of 241Am activity for a key comparison

2021 ◽  
Author(s):  
S. Pommé ◽  
T. Altzitzoglou ◽  
R. Van Ammel ◽  
G. Sibbens
Keyword(s):  
Proportional Counter ◽  
High Efficiency ◽  
Scintillation Counter ◽  
Measurement Techniques ◽  
Photon Counting ◽  
Key Comparison ◽  
Coincidence Counting ◽  
241Am Activity ◽  
Gamma Coincidence ◽  
Well Detector

AbstractThe JRC applied six measurement techniques to standardise the activity of an 241Am solution in the frame of the 2003 key comparison CCRI(II)-K2.Am-241. The methods used were alpha-particle counting at a defined small solid angle, high-efficiency particle and photon counting with a windowless 4π CsI(Tl) sandwich spectrometer, 4π alpha counting with a pressurised proportional counter, alpha-gamma coincidence counting and sum counting with a small pressurised proportional counter and a NaI(Tl) well detector, and 4π counting with a liquid scintillation counter. All results were consistent and an unusually low measurement uncertainty of 0.054% was achieved. An overview is presented of the outcome of the key comparison exercise, which demonstrates international equivalence.

scholarly journals Prediction and investigation between impeller blade shape parameters and performance parameters in CFD and ANN

2022 ◽  
Vol 10 (1) ◽  
pp. 1-12 ◽  
Author(s):  
Faye Jin ◽  
Ran Tao ◽  
Ruofu Xiao
Keyword(s):  
Single Channel ◽  
Reaction Force ◽  
Multiple Linear Regression Model ◽  
Centrifugal Impeller ◽  
Optimized Design ◽  
Performance Parameters ◽  
Shape Parameters ◽  
Impeller Blade ◽  
Pump Performance ◽  
Blade Shape

The blade shape parameters have a remarkable effect on the centrifugal pump performance. In order to reveal the relationship between these parameters and pump performance, a single channel was regarded as the research object to calculate its performance by numerical simulation, and the performance was measured on an experimental rig. The optimized ANN is proposed, and it is proved to be highly accurate. The ANN correlation coefficient of the total response could be above 0.997 after thousands of retaining. The sorts and degrees affecting performance parameters were found out by gray relation analysis. It was found that the blade angles at the leading edge were more influential for reaction force, head and minimum pressure, while the wrap angles had greater impact for efficiency. Furthermore, a multiple linear regression model was established to quantify the weight and trend of the influence of blade shape parameters on performance. The results provide a reference guide for the optimized design of centrifugal impeller to improve pump performance.

Geant4 Monte Carlo radioxenon beta-gamma coincidence efficiency simulation for a phoswich detector

2010 ◽  
Vol 285 (3) ◽  
pp. 475-482 ◽  
Author(s):  
Weihua Zhang ◽  
Pawel Mekarski ◽  
Jonathan Lam ◽  
Kurt Ungar ◽  
Eric Pellerin
Keyword(s):  
Monte Carlo ◽  
Phoswich Detector ◽  
Gamma Coincidence
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