scholarly journals The CdZnTe Detector with Slit Collimator for Measure Distribution of the Specific Activity Radionuclide in the Ground

2018 ◽  
Vol 170 ◽  
pp. 06005 ◽  
Author(s):  
V.E. Stepanov ◽  
A.G. Volkovich ◽  
V.N. Potapov ◽  
I.A. Semin ◽  
A.V. Stepanov ◽  
...  
Keyword(s):  
Research Reactor ◽  
Specific Activity ◽  
Kurchatov Institute ◽  
Cdznte Detector ◽  
Slit Collimator ◽  
The Monte Carlo Method ◽  
Lead Shielding ◽  
Spectrometric System ◽  
The Mathematical Model ◽  
Measure Distribution

From 2011 in the NRC "Kurchatov Institute" carry out the dismantling of the MR multiloop research reactor. Now the reactor and all technological equipment in the premises of the reactor were dismantled. Now the measurements of radioactive contamination in the reactor premises are made. The most contaminated parts of premises - floor and the ground beneath it. To measure the distribution of specific activity in the ground the CdZnTe detector (volume 500MM3) was used. Detector placed in a lead shielding with a slit collimation hole. The upper part of shielding is made movable to close and open the slit of the collimator. At each point two measurements carried out: with open and closed collimator. The software for determination specific activity of radionuclides in ground was developed. The mathematical model of spectrometric system based on the Monte-Carlo method. Measurements of specific activity of ground were made. Using the results of measurements the thickness of the removed layer of ground and the amount of radioactive waste were calculated.

The Simulation of Decontamination Works in Premises of the Research Reactor in NRC “Kurchatov Institute”

2013 ◽  
Author(s):  
Alexey Danilovich ◽  
Oleg Ivanov ◽  
Victor Potapov ◽  
Sergey Smirnov ◽  
Vyacheslav Stepanov
Keyword(s):  
Remote Sensing ◽  
Research Reactor ◽  
Research Centre ◽  
Kurchatov Institute ◽  
Radiation Fields ◽  
Before And After ◽  
Reduce Radiation Dose ◽  
Spectrometric System ◽  
Remote Sensing Methods ◽  
Russian Research

Application of remote sensing methods using a spectrometric collimated system allows obtaining information about features of a formation of radiation fields in contaminated premises. This information helps in a preparation of a phased plan for dismantling of contaminated equipment. When the survey of technological premises of the research reactor at the Russian Research Centre “Kurchatov institute” was conducted the remote controlled collimated spectrometric system was used [1]. With its help the scanning of surveyed premises were carried out. As a result of this work, the distribution pattern of radionuclides activity was restored. The simulation of decontamination works was carried out and maps of the distribution of activity and dose rate for surveyed premises were plotted and superimposed on its photo for situations before and after decontamination. The use of obtained results will allow significantly reduce radiation dose for staff at work on dismantling.

scholarly journals Research on textile materials for X-ray shielding

2021 ◽  
Vol 290 ◽  
pp. 01013
Author(s):  
Dong Liang ◽  
Fu Shen ◽  
Zizhen Bao ◽  
Yuchen Liu ◽  
Honghui Li
Keyword(s):  
Monte Carlo ◽  
Nuclear Technology ◽  
X Rays ◽  
X Ray ◽  
Textile Materials ◽  
The Monte Carlo Method ◽  
Technology Applications ◽  
Lead Shielding ◽  
Shielding Material ◽  
Better Than

X-ray radioactive rays are widely used with the continuous development of radioactive medicine and nuclear technology applications, as well as lead shielding material pollutions new no lead shielding material was needed. In this paper, the main properties of metal tungsten and bismuth as X-ray shielding materials were studied for the protection people avoid the 150 kV X-rays by the Monte Carlo method is used to study. According to simulation with 2 kg/m2, results show that performance of single metal material tungsten iron is superior to that of bismuth material. Tungsten-bismuth better than bismuth-tungsten with the case of equal-quality double-layer metal. The protection performance is better when the metal-mixed tungsten-bismuth ratio is 0.5: 0.5 or the tungsten ratio is large. The research provides effective support for the development of textile radiation protection materials.

Experience of Application of New Remote Controlled Instruments for Scanning of Distribution of Radioactive Contamination in Rooms With High Dose Rate

2011 ◽  
Author(s):  
V. E. Stepanov ◽  
A. S. Danilovich ◽  
O. P. Ivanov ◽  
V. N. Potapov ◽  
S. V. Smirnov ◽  
...  
Keyword(s):  
Remote Control ◽  
Radioactive Contamination ◽  
Gamma Camera ◽  
Background Radiation ◽  
High Dose Rate ◽  
High Dose ◽  
Kurchatov Institute ◽  
Nuclear Facilities ◽  
High Level ◽  
Spectrometric System

When carrying out the decommissioning of nuclear facilities is necessary to measure the distribution of radioactive contamination in the rooms and the equipment at high levels of background radiation. In the decommissioning of the reactor in the MR NRC “Kurchatov Institute” for such problems is developed and applied a few special systems with remote control. For a survey of high-level objects used mounted on the robot radiometric system. To determine the composition of pollutants and use a portable collimated spectrometric system. To obtain a detailed distribution of contamination of used remote-controlled gamma camera.

Validation of the Onsite Used Operational Code Against Burnup Measurement

2016 ◽  
Vol 3 (1) ◽  
Author(s):  
Michal Koleška ◽  
Michal Šunka ◽  
Jaroslav Ernest
Keyword(s):  
Experimental Data ◽  
Fission Product ◽  
Research Reactor ◽  
Fuel Burnup ◽  
Spent Fuel ◽  
Axial Distribution ◽  
Operational Code ◽  
Spectrometric System ◽  
Type Fuel

A spectrometric system was developed for spent fuel burnup evaluations at the LVR-15 research reactor, which employed highly enriched (36%) IRT-2M-type fuel. Such a system allows the measurement of fission product axial distribution by measuring certain nuclides, such as Cs137, Cs134, and their ratios, respectively. Within the paper, a comparison between experimental data provided by the spectrometric system and calculations in operational code called NODER is provided.

Application of Underwater Spectrometric System for Survey of Ponds of the MR Reactor (NRC Kurchatov Institute)

2013 ◽  
Author(s):  
Vyacheslav Stepanov ◽  
Victor Potapov ◽  
Alexey Safronov ◽  
Sergey Smirnov
Keyword(s):  
Kurchatov Institute ◽  
High Radiation ◽  
Effective Surface ◽  
Radiation Fields ◽  
Reactor Construction ◽  
Spectrometric Measurements ◽  
Reactor Pool ◽  
Czt Detectors ◽  
Spectrometric System ◽  
Irradiated Nuclear Fuel

The underwater spectrometric system for survey the bottom of material science multi-loop reactor MR ponds was elaborated. This system uses CdZnTe (CZT) detectors that allow for spectrometric measurements in high radiation fields. The underwater system was used in the spectrometric survey of the bottom of the MR reactor pool, as well as in the survey located in the MR storage pool of highly radioactive containers and parts of the reactor construction. As a result of these works irradiated nuclear fuel was detected on the bottom of pools, and obtained estimates of the effective surface activity detected radionuclides and created by them the dose rate.

scholarly journals Characterization and Correction of the Geometric Errors using a Confocal Microscope for Extended Topography Measurement, Part II: Experimental Study and Uncertainty Evaluation

Electronics ◽  
2019 ◽  
Vol 8 (11) ◽  
pp. 1217 ◽  
Author(s):  
Wang ◽  
Gómez ◽  
Yu
Keyword(s):  
Mathematical Model ◽  
Measurement Data ◽  
Confocal Microscope ◽  
Geometric Errors ◽  
Data Partition ◽  
The Monte Carlo Method ◽  
Measurement Results ◽  
The Mean ◽  
The Mathematical Model ◽  
Certified Values

This paper presents the experimental implementations of the mathematical models and algorithms developed in Part I. Two experiments are carried out. The first experiment determines the correction coefficients of the mathematical model. The dot grid target is measured, and the measurement data are processed by our developed and validated algorithms introduced in Part I. The values of the coefficients are indicated and analyzed. Uncertainties are evaluated using the Monte Carlo method. The second experiment measures a different area of the dot grid target. The measurement results are corrected according to the coefficients determined in the first experiment. The mean residual between the measured points and their corresponding certified values reduced 29.6% after the correction. The sum of squared errors reduced 47.7%. The methods and the algorithms for raw data processing, such as data partition, fittings of dots’ centers, K-means clustering, etc., are the same for the two experiments. The experimental results demonstrate that our method for the correction of the errors produced by the movement of the lateral stage of a confocal microscope is meaningful and practicable.

scholarly journals The Optimal Control of Two Work-Stealing Deques, Moving One After Another in a Shared Memory

2019 ◽  
Vol 10 (1) ◽  
pp. 19-32
Author(s):  
Eugene Aleksandrovich Barkovsky ◽  
Anna Aleksandrovna Lazutina ◽  
Andrew Vladimirovich Sokolov
Keyword(s):  
Shared Memory ◽  
Simulation Models ◽  
Work Stealing ◽  
New Approach ◽  
Integer Points ◽  
Network Applications ◽  
Cyclic Representation ◽  
The Monte Carlo Method ◽  
The One ◽  
The Mathematical Model

In the parallel work-stealing load balancers, each core owns personal buffer of tasks called deque. One end of the deque is used by its owner to add and retrieve tasks, while the second end is used by other cores to steal tasks. In the paper two representation methods of deques are analyzed: partitioned serial cyclic representation of deques (one of the conventional techniques); and the new approach proposed by our team, without partition of shared memory in advance between deques moving one after another in a circle. Previously we analyzed these methods for representing FIFO queues in network applications, where the “One after another” way gave the best result for some values of the system parameters. Purpose of this research is to construct and analyze models of the process of work with two circular deques located in shared memory, where they movie one after another in a circle. The mathematical model is constructed in the form of a random walk by integer points in the pyramid. The simulation model is constructed using the Monte Carlo method. The used work-stealing strategy is stealing of one element. We propose the mathematical and simulation models of this process and carry out numerical experiments.

Computational validation of the fission rate distribution experimental benchmark at the JSI TRIGA Mark II research reactor using the Monte Carlo method

2018 ◽  
Vol 112 ◽  
pp. 94-108 ◽  
Author(s):  
Žiga Štancar ◽  
Loïc Barbot ◽  
Christophe Destouches ◽  
Damien Fourmentel ◽  
Jean-François Villard ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Method ◽  
Research Reactor ◽  
Fission Rate ◽  
Rate Distribution ◽  
The Monte Carlo Method ◽  
Triga Mark Ii ◽  
Computational Validation

Analysis of Mechanical Error’s Effect on the Measurement Accuracy of the Six-Axis Force Sensor

2014 ◽  
Vol 627 ◽  
pp. 177-181
Author(s):  
Ru Nan Liang
Keyword(s):  
Mathematical Model ◽  
Monte Carlo ◽  
Theoretical Basis ◽  
Measurement Accuracy ◽  
Force Sensor ◽  
Stewart Platform ◽  
System Structure ◽  
The Monte Carlo Method ◽  
Six Degree Of Freedom ◽  
The Mathematical Model

Force sensor based on the six degree of freedom (6-DoF) Stewart platform is universal for wide applications. Mechanism errors are significant for its measuring accuracy. However, because of the multi-variables and the complicated forms, it is difficult to solve the expression directly. The Monte Carlo method is proposed based on the analysis of the system structure and the mathematical model. The effect of mechanism errors on the measurement accuracy was assessed. With this method, a complex accuracy expression of the sensor could be avoided. It also provided a theoretical basis for designing the sensor of the Stewart platform.

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