Research on the Neutron Multiplicity Pulse Trains Computer Simulation

2018 ◽  
Author(s):  
Sufen Li ◽  
Quanhu Zhang ◽  
Yonggang Huo ◽  
Man Zhou
Keyword(s):  
Computer Simulation ◽  
Neutron Multiplicity ◽  
Neutron Pulse ◽  
Simulation Code ◽  
Pulse Trains ◽  
Capture Time ◽  
Non Destructive

Neutron multiplicity counting (NMC) is one of the most advanced Non-Destructive Assay (NDA) techniques. In this paper, the principle and method of generation of neutron pulse trains is studied. A model of 4π cube counter is established for 238Pu sample, the capture time of neutrons is gained by simulation code, then output the neutron pulse trains for post dispose from generated fissile initial-times. The result from post dispose of this neutron pulse trains show a small bias compared with input value, it’s an evidence for the validity of simulation in this paper.

The Developments and its Applicaton Examples of Computer Simulation Code on Heat Treatment Process

2013 ◽  
Vol 651 ◽  
pp. 589-594
Author(s):  
Dong Ying Ju ◽  
Li Ping Cao
Keyword(s):  
Heat Treatment ◽  
Computer Simulation ◽  
Induction Heat ◽  
Simulation Code ◽  
Induction Heat Treatment ◽  
Coupled Equations ◽  
Field Diffusion ◽  
Material Process ◽  
And Function ◽  
Kinetics Of

Strategy and function of a new developed FEM code COSMAP(COmputer Simulation of MAterial Process) for surface hardening during of thermo-mechanical processing, including heat treatment, carbonizing and nitriding and induction heat treatment, is briefly introduced in this paper. The simulation code is developed based on the metallo-thermo-mechanical theory considering the coupled equations of magnetic or electrical field, diffusion, heat conduction, inelastic stresses and kinetics of phase transformation. Some examples of simulation and the experimental verification for induction heat treatment, carbonized quenching, carbonized- nitrided-quenching process of a cylinder and ring as well as a gear are illustrated, and comparison of the simulated values of distortion, residual stresses and profile of induced phases with the experimental data is made with some discussions.

Application research on neutron-gamma discrimination based on BC501A liquid scintillator

Kerntechnik ◽  
2021 ◽  
Vol 86 (6) ◽  
pp. 437-444
Author(s):  
J. Luo ◽  
S. Hou
Keyword(s):  
Fast Neutron ◽  
Figure Of Merit ◽  
Gamma Ray ◽  
Liquid Scintillator ◽  
Comparison Method ◽  
Mean Value ◽  
Neutron Multiplicity ◽  
Nuclear Disarmament ◽  
Zero Crossing ◽  
Non Destructive

Abstract Liquid organic scintillators are widely used in non-destructive analysis, which plays an important role in nuclear disarmament verification. This paper focused on studying the neutron-gamma discrimination technology in the fast neutron multiplicity measuring counter based on BC501A liquid scintillation detector. First, the charge comparison method, the zero-crossing time method and the rise time method were compared via the Geant4 and Matlab algorithm, and the result shows that charge comparison has the highest Figure of Merit. Then, a neutron-gamma discrimination system based on the six-probe fast neutron multiplicity counter was built and tested with a conclusion that the mean value of Figure of merit is 1.08, which verify the satisfactory neutron-gamma discriminating capability of the system. Finally, for the uranium samples, the mass are detected by fast neutron multiplicity counter, and the enrichment are measured by the characteristic gamma-ray signals using the system. The experimental results are in good agreement with the actual data.

scholarly journals Non-Destructive Surface Analysis of Materials by MeV Ion Beams, Microscopy and Computer Simulation

2016 ◽  
Vol 22 (S4) ◽  
pp. 42-43
Author(s):  
J. Pacheco de Carvalho ◽  
C. F. R. Pacheco ◽  
A. D. Reis
Keyword(s):  
Computer Simulation ◽  
Surface Analysis ◽  
Ion Beams ◽  
Non Destructive

Computer simulation of synchrotron radiation in two dimensions

1982 ◽  
Vol 28 (1) ◽  
pp. 133-140
Author(s):  
L. T. Wang ◽  
J. M. Dawson ◽  
A. T. Lin ◽  
C. R. Menyuk ◽  
T. Tajima
Keyword(s):  
Computer Simulation ◽  
Wave Propagation ◽  
Synchrotron Radiation ◽  
Two Dimensions ◽  
Two Dimensional ◽  
Simulation Code ◽  
Plasma Effects

Plasma effects on the emission of synchrotron radiation are investigated using a two-dimensional electromagnetic relativistic simulation code. Results are compared with those for a vacuum; it is found that the emission lies between the vacuum emission for nc and nc + 1 where nc is the critical harmonic for EM wave propagation (nc = ωp/Ω0).

Computer simulation code for particle growth in liquid phase sintering

1988 ◽  
Vol 22 (1) ◽  
pp. 71-76 ◽  
Author(s):  
J.M. Chaix ◽  
M. Guyon ◽  
J. Rodriguez ◽  
C.H. Allibert
Keyword(s):  
Computer Simulation ◽  
Liquid Phase ◽  
Particle Growth ◽  
Liquid Phase Sintering ◽  
Simulation Code

Nuclear Material Measurement Based on Fast Neutron Multiplicity Counter

2020 ◽  
Author(s):  
Xianghua Su ◽  
Quanhu Zhang ◽  
Suxia Hou ◽  
Sufen Li ◽  
Jianqing Yang ◽  
...  
Keyword(s):  
Fast Neutron ◽  
Detection Efficiency ◽  
Mass Range ◽  
Nuclear Material ◽  
Neutron Multiplicity ◽  
Analytical Equation ◽  
Analysis Method ◽  
Sample Mass ◽  
Mechanism Of Interaction ◽  
Non Destructive

Abstract Fast neutron multiplicity counting (FNMC) analysis method, as a new non-destructive analysis method for nuclear materials, plays an increasingly important role in the measurement of nuclear material properties. Based on the derivation of the FNMC analytical equation of Pu material, the method of solving the sample parameters was given. By analyzing the mechanism of interaction of neutrons and matter, the model used by Geant4 (version 10.4) software was determined, and a set of three-layer, fast neutron multiplicity counters with six liquid scintillation detectors per layer was constructed. Using the fast neutron multiplicity counter to analyze the measured parameters, the detection efficiency variation was less than 0.4% within the 150g sample mass range, and the PuO2 fluctuation was less than the metal Pu. By studying the detection efficiency and the multiplicity counting rate as a function of sample mass, within the 150g sample mass range, both basically meet the model assumptions of the FNMC analytical equation. The metal Pu and PuO2 samples were set separately, and the FNMC analysis equation was solved. When the sample mass was within 150g, the sample mass solution deviation was less than 10%. The results show that the built-in fast neutron multiplicity counter can better measure Pu sample properties.

Coincidence Gate Utilization Factors for Neutron Correlation Counters With Up to Three Components in the Die-Away Profile

2007 ◽  
Author(s):  
S. Croft ◽  
R. D. McElroy ◽  
S. C. Kane
Keyword(s):  
Correlation Analysis ◽  
Fourth Order ◽  
Time Profile ◽  
Shift Register ◽  
Neutron Multiplicity ◽  
Design Performance ◽  
Capture Time ◽  
Analytical Expressions ◽  
Three Components

We present analytical expressions for the gate utilization factors (GUFs), up to fourth order, for both signal triggered and random triggered histograms based on a three-component capture time profile. These are useful for refined design performance calculations of passive neutron multiplicity counters using shift register correlation analysis. To our knowledge, these expressions are new.

Time-dependent angular and energy distributions of sputtered copper atoms

2000 ◽  
Vol 78 (9) ◽  
pp. 865-874
Author(s):  
R G Vichev ◽  
D S Karpuzov
Keyword(s):  
Computer Simulation ◽  
Time Dependent ◽  
Moving Target ◽  
Mass Ratio ◽  
Atomic Collision ◽  
Energy Distributions ◽  
Simulation Code ◽  
Event Driven ◽  
Sputtering Yield

Time reference was introduced in the TRIM computer simulation code without changing the "event-driven" logic of the program. The code was applied to model the atomic collision cascades and sputtering of amorphous copper targets caused by bombardment of keV ions of different masses (Be, Ne, Ar, Cu, Xe, Au). Time-dependent characteristics of ion-induced processes such as mean number and energy of moving target atoms, number of collisions and vacancies (or) recoils created, sputtering yield, mean energy and angle of ejection of sputtered atoms were obtained, and their dependence on the ion/atom mass ratio is discussed. PACS No.: 79.20-m

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