Improvement of the passive efficiency calibration of the segmented gamma scanner

Kerntechnik ◽  
2021 ◽  
Vol 86 (1) ◽  
pp. 70-77
Author(s):  
S. Hou ◽  
J. Luo ◽  
C. Yang ◽  
W. Zhang
Keyword(s):  
Detection Efficiency ◽  
Calibration Method ◽  
Rapid Analysis ◽  
Efficiency Calibration ◽  
Radioactive Material ◽  
Transmission Measurement ◽  
Emission Measurement ◽  
Actual Measurement ◽  
Analysis System ◽  
Calibration Time

Abstract The Segmented Gamma Scanner(SGS) technology is specially used for type identification and activity quantitative analysis of radioactive material in sealed containers, which mainly divided into the transmission measurement and the emission measurement. In actual measurement process, it cannot meet the need for rapid analysis because the efficiency calibration time takes up more than 60% of the whole detect time in the data analysis. Whereas most previous research have focused on theory or specific applications, this research groups aim to different aspects of the SGS technique and direct it at an audience with interests in the need for rapid analysis. The Monte Carlo simulation calculation models were established by the passive efficiency calibration method, and then the detection efficiency database was carried out based on the experimental verification. Lots of work was used to analysis the influence of crosstalk between layers and interpolation step. Furthermore, the database was implanted into the control and analysis system to complete the measurement experiments. The results show the measuring time of single waste drums is about 30 min, and the average relative deviation is less than 10%, so the problem that the time taken to calibrate the detection efficiency is too long has been solved effectively. The efficiency in the use of SGS technology has been increased.

Single source-based energy and efficiency calibration method for the assessment of an alpha imaging detector

2021 ◽  
Vol 16 (12) ◽  
pp. C12017
Author(s):  
G. Kim ◽  
I. Lim ◽  
B. Kim ◽  
K. Song ◽  
J.-G. Kim
Keyword(s):  
Quantitative Analysis ◽  
Detection Efficiency ◽  
Calibration Method ◽  
Alpha Particles ◽  
Efficiency Calibration ◽  
Spectrometric Method ◽  
Standard Source ◽  
Imaging Detector ◽  
Single Standard ◽  
The Individual

Abstract An alpha imaging detector acquires a two-dimensional distribution of a sample that emits alpha particles. For the quantitative analysis of the image of an alpha-emitting sample, the individual energies of the alpha particles must be identified, which can be achieved using the spectrometric method after detector calibration. In this study, an energy and efficiency calibration method was investigated to assess an alpha imaging detector. The calibration was performed using a single standard source of Am-241 based on the energy loss characteristic of an alpha particle. The feasibility of the calibration method was evaluated using another source, Ac-225. The calibrated alpha imaging detector was evaluated in terms of energy resolution and detection efficiency, and the alpha imaging detector was found to be efficiently calibrated using a single standard source. The calibrated alpha imaging detector appears promising for the quantitative analysis of samples that emit alpha particles.

scholarly journals Cobot User Frame Calibration: Evaluation and Comparison between Positioning Repeatability Performances Achieved by Traditional and Vision-Based Methods

Robotics ◽  
2021 ◽  
Vol 10 (1) ◽  
pp. 45
Author(s):  
Roberto Pagani ◽  
Cristina Nuzzi ◽  
Marco Ghidelli ◽  
Alberto Borboni ◽  
Matteo Lancini ◽  
...  
Keyword(s):  
Quantitative Analysis ◽  
Production Line ◽  
Calibration Method ◽  
Fiducial Marker ◽  
Positioning System ◽  
Local Calibration ◽  
Calibration Methods ◽  
Robot Positioning ◽  
Good Repeatability ◽  
Calibration Time

Since cobots are designed to be flexible, they are frequently repositioned to change the production line according to the needs; hence, their working area (user frame) needs to be often calibrated. Therefore, it is important to adopt a fast and intuitive user frame calibration method that allows even non-expert users to perform the procedure effectively, reducing the possible mistakes that may arise in such contexts. The aim of this work was to quantitatively assess the performance of different user frame calibration procedures in terms of accuracy, complexity, and calibration time, to allow a reliable choice of which calibration method to adopt and the number of calibration points to use, given the requirements of the specific application. This has been done by first analyzing the performances of a Rethink Robotics Sawyer robot built-in user frame calibration method (Robot Positioning System, RPS) based on the analysis of a fiducial marker distortion obtained from the image acquired by the wrist camera. This resulted in a quantitative analysis of the limitations of this approach that only computes local calibration planes, highlighting the reduction of performances observed. Hence, the analysis focused on the comparison between two traditional calibration methods involving rigid markers to determine the best number of calibration points to adopt to achieve good repeatability performances. The analysis shows that, among the three methods, the RPS one resulted in very poor repeatability performances (1.42 mm), while the three and five points calibration methods achieve lower values (0.33 mm and 0.12 mm, respectively) which are closer to the reference repeatability (0.08 mm). Moreover, comparing the overall calibration times achieved by the three methods, it is shown that, incrementing the number of calibration points to more than five, it is not suggested since it could lead to a plateau in the performances, while increasing the overall calibration time.

Efficiency calibration of airborne γ-ray spectrometer using sourceless efficiency calibration method

2019 ◽  
Vol 322 (2) ◽  
pp. 613-619
Author(s):  
Hexi Wu ◽  
Yibao Liu ◽  
Yujuan Liu ◽  
Qianglin Wei ◽  
Bo Yang
Keyword(s):  
Calibration Method ◽  
Efficiency Calibration ◽  
Γ Ray

scholarly journals On-Site Calibration Method for Line-Structured Light Sensor-Based Railway Wheel Size Measurement System

Sensors ◽  
2021 ◽  
Vol 21 (20) ◽  
pp. 6717
Author(s):  
Yunfeng Ran ◽  
Qixin He ◽  
Qibo Feng ◽  
Jianying Cui
Keyword(s):  
Structured Light ◽  
Field Tests ◽  
Calibration Method ◽  
Field Application ◽  
Calibration Error ◽  
Epipolar Constraint ◽  
Calibration Process ◽  
Calibration Methods ◽  
Calibration Accuracy ◽  
Calibration Time

Line-structured light has been widely used in the field of railway measurement, owing to its high capability of anti-interference, fast scanning speed and high accuracy. Traditional calibration methods of line-structured light sensors have the disadvantages of long calibration time and complicated calibration process, which is not suitable for railway field application. In this paper, a fast calibration method based on a self-developed calibration device was proposed. Compared with traditional methods, the calibration process is simplified and the calibration time is greatly shortened. This method does not need to extract light strips; thus, the influence of ambient light on the measurement is reduced. In addition, the calibration error resulting from the misalignment was corrected by epipolar constraint, and the calibration accuracy was improved. Calibration experiments in laboratory and field tests were conducted to verify the effectiveness of this method, and the results showed that the proposed method can achieve a better calibration accuracy compared to a traditional calibration method based on Zhang’s method.

scholarly journals INVESTIGATION OF M2044 VOLTAMMETER ERRORS FOR PERSPECTIVE IMPROVEMENT OF CALIBRATION METHOD

2018 ◽  
pp. 25-29
Author(s):  
M. S. Titova ◽  
K. V. Epifantsev ◽  
T. P. Mishura
Keyword(s):  
Relative Error ◽  
Calibration Method ◽  
Main Design ◽  
Calibration Time

The method of checking voltmeters and ammeters involves checking certain intervals on the tool scale, which requires a sufficient amount of time from the verifier engineer. In the considered graphs, which revealed repeated dependences of the main calibration errors on the calibration time. Therefore, this study is important to verify that it is not. The main design of the study was to improve the scale of the voltmeter based on the meter readings during meter calibration at Techpribor during the testing lab from 2016 to 2018. When studying the calibration graphs, jumps in the segment in the range from 40 to 90 V. It is assumed that an increase in the relative error provided that it was used for various fields of technology to improve the verification procedure for analog instruments. The marked interval should be checked on each scale mark on each limit.

Study of equivalent efficiency calibration method for radioactive gas source measured on HPGe detectors

2019 ◽  
Vol 57 (5) ◽  
pp. 599-606
Author(s):  
Gongshuo Yu ◽  
Xuesong Li ◽  
Tao Bai ◽  
Xiaobing He ◽  
Jinlong Fan ◽  
...  
Keyword(s):  
Calibration Method ◽  
Efficiency Calibration ◽  
Gas Source ◽  
Hpge Detectors

Application of parallel recorded EELS to analysis of beam-sensitive organic compounds

1988 ◽  
Vol 46 ◽  
pp. 632-633
Author(s):  
R.D. Leapman
Keyword(s):  
Electron Microscope ◽  
Organic Compounds ◽  
Detection Efficiency ◽  
Electron Dose ◽  
Recording Time ◽  
Parallel Detection ◽  
Optimum Technique ◽  
Tem Mode ◽  
Analysis System ◽  
Counting Statistics

Electron energy loss spectroscopy (EELS) is the optimum technique for studying specific mass loss of light elements from organic compounds under irradiation in the electron microscope. The recent availability of parallel detection systems has provided a factor of approximately 1000 improvement in detection efficiency compared with serial detection. This implies a corresponding reduction in recording time or a reduction in the electron dose needed to obtain sufficient counting statistics for elemental detection. In addition, parallel detection allows us to perform “real-time” EELS, i.e. to observe the actual decay of characteristic peaks in the spectrum.EELS spectra have been recorded with a Gatan model 607 spectrometer fitted with a Gatan model 666 parallel detector based on a 1024 channel photodiode array. Data were transfered to a Tracor Northern TN5500 analysis system for display and processing. Samples were examined at 100 keV beam energy in a Hitachi H700H electron microscope operated in the TEM mode at 1000X to 10000X magnification and with a 30 mrad collection semi-angle defined by the objective aperture.

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