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Modeling of Gadolinium-Based Neutron Converter

#T-1157


Modeling and Investigation of Characteristics of Solid-State Converters of Neutron Radiation for Increasing the Registration Efficiency of Detectors

Tech Area / Field

  • INS-DET/Detection Devices/Instrumentation

Status
8 Project completed

Registration date
24.05.2004

Completion date
18.11.2009

Senior Project Manager
Safronova O N

Leading Institute
Physical-Technical Institute, Tajikistan, Dushanbe

Supporting institutes

  • Tajik State National University, Tajikistan, Dushanbe

Collaborators

  • Physikalisch-Technische Bundesanstalt, Germany, Braunschweig

Project summary

In the development of detectors of neutrons the basic attention is given to the converters of neutron radiation, which convert neutron radiation with zero electric charge to the charged one. The type of the used converter determines the basic characteristics of detectors, such as efficiency of registration, spatial and energetic resolution, and so on.

Mathematical modeling of the basic characteristics of converters helps to choose the most optimal types of converters and their geometrical parameters. This allows one to reduce time and material inputs spent for the experimental investigations of characteristics of converters and detectors. At the same time the development of new types of converters and detectors on their basis presumes to improve essentially parameters of detectors and to reduce the price of their manufacture and operation.

Among the solid-state converters of neutrons the greatest efficiency of registration up to 30% has been managed to be received on gadolinium foils. Such converters were investigated in CERN and some other centers. Nevertheless the emission electrons do not posses high energy (Еmid = 70 KEV) that complicates their output from the material of converters. Developers face with the following difficulties – in order to increase the probability of interaction of neutrons with the substance of the converter it is necessary to increase its thickness, but for an effective output of secondary electrons this thickness should be reduced. This contradiction dictates necessity of search of essentially new solution.

The purpose of this work is the computer modeling of gadolinium-based converters and the study of their characteristics. During the implementation of the project the mathematical models of converters of various geometrical forms will be developed, the basic geometrical parameters of converters, energy and corners of falling of particles will vary also in the computer simulations. Separate kinds of converters will be developed and manufactured; and their characteristics will be investigated that will allow to estimate the correctness of the chosen models and calculations.

Implementation of the project will allow developing converters with the optimal geometrical parameters and detectors with the improved characteristics. Mathematical models and developed software can be a basis of the applied software package for realization of further calculations. The software package will allow carrying out calculations on the developed models and algorithms and will allow to create a database on the effective cross-sections of various geometrical bodies and probabilities of the secondary electron outputs from these bodies.

Implementation of the project will allow renewing scientific connections of the scientists of Tajikistan with scientists of other countries and will allow integrating to the international scientific community.

As the result of the project implementation students and young scientists, involved in the project activity, will be trained as experts in the field of Nuclear Instrumentations, Measurement, and Mathematical Modeling.

Participants of the project have wide experience in development of various detectors of nuclear radiation, both for basic and for applied researches. Authors in Physics-Technical Institute of Academy of Sciences of the Republic of Tajikistan have developed and constructed the detector of thermal neutrons on the basis of the multiwire proportional chamber with 3Не-based converter. The detector more than 10 years is maintained on beams of pulse reactor IBR-2 in the Laboratory of Neutron Physics of the Joint Institute for Nuclear Research in Dubna (Moscow region).

Authors have been dealing with the problem of modeling of converters on the basis of gadolinium foils. /D.A.Abdushukurov, A.A.Djuraev et.al. Model calculation of efficiency of gadolinium- based converters of thermal neutrons. Nucl. Instr. and Meth. B 84 (1994) 400-404/.


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