scholarly journals Muographic data analysis method for medium-sized rock overburden inspections

2016 ◽  
Author(s):  
Hiroyuki K. M. Tanaka ◽  
Michinori Ohshiro
Keyword(s):  
Detection Efficiency ◽  
Areal Density ◽  
Muon Flux ◽  
Accurate Information ◽  
Detailed Knowledge ◽  
Analysis Method ◽  
Simple Task ◽  
Simple Method ◽  
Geometrical Acceptance ◽  
The Absolute

Abstract. Muographic measurements of rock overburdens are of particular interests because they can be applied to natural resources and undiscovered cave explorations, and even to searching for hidden chambers in historic architectural structures. In order to derive the absolute density distribution of the overburden, we conventionally needed to know the accurate information about the measurement conditions, e.g., the detector's geometrical acceptance, detection efficiency, measurement time, etc. in order to derive the absolute value of the transmitted muon flux. However, in many cases, it is not a simple task to accurately gauge such conditions. Open-sky muon data taken with the same detector are useful as reference data to cancel these factors, however, if the detector is not transportable, this data taking method is not feasible. In this work, we found that the transmitted muon flux will follow a linear function of the areal density along the muon path as long as the incident muon energies are below a few hundred GeV. Based on this finding, we proposed a simple analysis method that does not require detailed knowledge of the detector's conditions by combining the independently measured density information for the partial volume of the target. We anticipate that this simple method is applicable to future muographic measurements of rock overburdens.

scholarly journals Muographic data analysis method for medium-sized rock overburden inspections

2016 ◽  
Vol 5 (2) ◽  
pp. 427-435 ◽  
Author(s):  
Hiroyuki K. M. Tanaka ◽  
Michinori Ohshiro
Keyword(s):  
Detection Efficiency ◽  
Areal Density ◽  
Muon Flux ◽  
Accurate Information ◽  
Detailed Knowledge ◽  
Analysis Method ◽  
Simple Task ◽  
Simple Method ◽  
Geometrical Acceptance ◽  
The Absolute

Abstract. Muographic measurements of rock overburdens are of particular interest because they can be applied to natural resources and undiscovered cave explorations, and even to searching for hidden chambers in historic architectural structures. In order to derive the absolute density distribution of the overburden, we conventionally needed to know accurate information about the measurement conditions, e.g., the detector's geometrical acceptance, detection efficiency, and measurement time, in order to derive the absolute value of the transmitted muon flux. However, in many cases, it is not a simple task to accurately gauge such conditions. Open-sky muon data taken with the same detector are useful as reference data to cancel these factors; however, if the detector is not transportable, this data taking method is not feasible. In this work, we found that the transmitted muon flux will follow a simple function of the areal density along the muon path as long as the incident muon energies are below a few hundred GeV. Based on this finding, we proposed a simple analysis method that does not require detailed knowledge of the detector's conditions by combining the independently measured density information for the partial volume of the target. We anticipate that this simple method is applicable to future muographic measurements of rock overburdens.

Analysis of Variation of Natural Frequency and Resonant Stress of Blade

2006 ◽  
Author(s):  
Yasutomo Kaneko ◽  
Kazushi Mori ◽  
Hiroyuki Yamashita ◽  
Kenji Sato
Keyword(s):  
Natural Frequency ◽  
Interaction Force ◽  
Vibration Characteristics ◽  
Analysis Method ◽  
Simple Method ◽  
Manufacturing Tolerance ◽  
First Order Second Moment ◽  
Predicted Values ◽  
Analysis Of Variation ◽  
Second Moment Method

A compressor blade of low aspect ratio is a typical shell-type structure and its natural frequency and vibratory stress are sensitive to a manufacturing tolerance. In designing a blade, the designer should take the variation of the vibration characteristics into account, and evaluate the mechanical strength of the blade. This paper, first, proposes an analysis method for predicting the resonant stress due to the interaction force between the vane and blade, using 3-D CFD and the modal analysis method based on 3-D FEM. Rig tests of the compressor are carried out, and the measured frequencies and vibratory stresses are compared to predicted values, and the validity of the proposed method is verified. In the second place, a practical analysis method for predicting the variation of the natural frequency and vibratory stress of the blade is proposed, where the variation of the vibration characteristics such as a natural frequency and a resonant stress is evaluated by the first order second moment method in addition to 3-D CTD and 3-D EEM. The calculated results are compared with measured ones. From the results, it is confirmed that the variation of the vibration characteristics can be predicted by the simple method proposed in this paper.

The absolute detection efficiency of an NE213 liquid scintillator for neutrons in the energy range 50–450 MeV

1982 ◽  
Vol 192 (2-3) ◽  
pp. 407-413 ◽  
Author(s):  
S. Cierjacks ◽  
M.T. Swinhoe ◽  
M.T. Swinhoe ◽  
L. Buth ◽  
S.D. Howe ◽  
...  
Keyword(s):  
Energy Range ◽  
Detection Efficiency ◽  
Liquid Scintillator ◽  
The Absolute

Measurement of the absolute vertical muon flux between0.76 GeV/c and1.25 GeV/c

1974 ◽  
Vol 22 (2) ◽  
pp. 328-336 ◽  
Author(s):  
L. K. Ng ◽  
M. G. Thompson ◽  
M. R. Whalley
Keyword(s):  
Muon Flux ◽  
The Absolute

A Simple Method for Determining the Absolute Configuration of alpha-Amino Acids

1999 ◽  
Vol 76 (1) ◽  
pp. 77 ◽  
Author(s):  
Esteban P. Urriolabeitia ◽  
María Dolores Díaz-de-Villegas
Keyword(s):  
Amino Acids ◽  
Absolute Configuration ◽  
Simple Method ◽  
The Absolute

scholarly journals Calibration of the Absolute Efficiency of Well-Type NaI(Tl) Scintillation Detector in 0.121–1.408 MeV Energy Range

2018 ◽  
Vol 2018 ◽  
pp. 1-6 ◽  
Author(s):  
Dalal Al Oraini
Keyword(s):  
Energy Range ◽  
Sodium Iodide ◽  
Detection Efficiency ◽  
Solid Angle ◽  
Radioactive Isotopes ◽  
Activity Measurements ◽  
Absolute Efficiency ◽  
Sodium Iodide Detector ◽  
The Absolute ◽  
Detector Material

Well-type NaI(Tl) detectors are beneficial for low-level photon activity measurements because of the near 4π solid angle that can be gained with them. The detection efficiency can differ with the source-to-detector system geometries, the absorption of the photon in the detector material, and attenuation layers in front of the detector face. For these purposes, the absolute efficiency and the coincidence corrections of the well-type sodium iodide detector have been measured at 0.121–1.408 MeV energy range (obtained from 152Eu, 137Cs, and 60Co radioactive isotopes). The covenant between the experimental (present work) and the published theoretical values is good, with the high discrepancies being less than 1%.

Simulation and Construction of Fast Neutron Multi-Counter Based on Liquid Flash

2020 ◽  
Author(s):  
Qifan Chen ◽  
Quanhu Zhang ◽  
Suxia Hou ◽  
Sufen Li ◽  
Jianqing Yang ◽  
...  
Keyword(s):  
Fast Neutron ◽  
Radial Direction ◽  
Detection Efficiency ◽  
Detection System ◽  
Geometric Model ◽  
Measurement Methods ◽  
Analysis Method ◽  
Detection Systems ◽  
Simulated Sample ◽  
Sample Measurement

Abstract As an important attribute authentication technology, the Fast Neutron Multiplicity Counting analysis method has the potential to solve the shortcomings of existing measurement methods. In this paper, the Geant4 10.4 program based on Monte Carlo method is used to simulate the geometric model, physical process and primary behavior, and simulate the detection system composed of six liquid flash probes in three different layouts to achieve the measurement of sample properties. Pu samples were measured by using different layout detection systems. By comparing the detection efficiency and the multiplicity count rate, it was determined that the No. 2 layout was used as the final detection system, and the detection efficiency was about 3.9%. The variation of the detection efficiency of the simulated sample in the radial direction is obtained. The uniform detection efficiency zone of the system is ±3 cm from the center of the cavity. The detection efficiency deviation is less than 0.12%, the mass deviation is less than 5%, and the deviation variance is less than 10%, and the detection system meets the requirements for sample measurement. Studies have shown that the built detection system has the ability to measure sample properties and can be used in the next step of the study.

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