Objective
Different options for the development of an individual electronic neutron dosemeter were investigated within this contract. Original proposal concerned two families of detection principles which were suited in order to improve the methods and the devices:
- silicon diodes sensor
- superheated emulsions
And the question was: is it possible to improve one of the devices or the two devices for personal neutron radioprotection? It is the framework within which the different laboratories worked during this contract, trying to point out various solutions as complementary as possible.
The intrisic nature of the two different neutron detectors is quite different, still the two systems appear suitable for an optimised approach to practical neutron dosimetry. The two approaches have been investigated aiming at the development of dosemeters optimised for various environments differing in terms of radiation field quality and strength, as well as condition of noise, vibration and temperature. Detectors were first individually studies with monoenergetic neutron beams, at the IPSN Bruyeres le Chatel for silicon diodes and PTB Braunschweig for bubble detectors. The resulting devices were finally tested thanks joint to irradiations for all contractors carried out in IPSN Cadarache with radionucleides sources, thermal beams and realistic benchmark fields.
Superheated emulsions were mainly studied by DCMN Pisa and later one by IRD Pragua.
Over the two years of research, the activities of DCMN were divided into an initial investigation into the physics of these detectors followed by the exploitation of the previous findings for the development of a neutron survey meter and a spectrometer of new conception.
THIS PROPOSAL IS THE CONTINUATION OF THE CONTRACT B 1700 20 WHICH BEGUN IN NOVEMBER 1990.
IT CONCERNS THE STUDY OF AN ELECTRONIC NEUTRON DOSEMETER (REAL TIME DOSEMETER). THIS DOSEMETER IS MADE WITH:
- A SENSOR REALIZED WITH A BORON 10 IMPLANTED POLYETHYLENE FOIL AND A DIODE DETECTOR
- A MICROCOMPUTER WHICH IS CONCERNED WITH INFORMATION TREATMENT. IN THE PRESENT SYSTEM THE DIFFERENTIAL METHOD IS USED BY THE MEANS OF TWO DIODES, ONE WITH A CONVERTER, THE OTHER WITHOUT. IN THESE CONDITIONS WE ARE ABLE TO SEPARATE THE NEUTRON RESPONSE FROM "INTERFERING RESPONSES" I.E. ELECTRONIC BACKGROUND, Y CONTRIBUTION.
IN THE FRAME OF THE 1990-1992 CONTRACT, MODELIZATION, CALCULATIONS AND SOME EXPERIMENTS HAVE BEEN REALIZED OR ARE IN PROGRESS. LIMITATIONS OF THE DEVICE EXIST AND SEVERAL POINTS ARE STILL TO BE STUDIED: THE MINIMUM DETECTABLE NEUTRON DOSE EQUIVALENT IN MIXED FIELDS, THE INFLUENCE OF A PHANTOM, THE RESPONSE TO INTERMEDIATE NEUTRONS.
FOR THE 1992-1994 CONTRACT WE PROPOSE TWO COMPONENTS:
1- CONTINUATION AND COMPLETION OF CALCULATIONS AND EXPERIMENTAL TESTS ON THE TWO DEVICES EXISTING IN LEPOFI AND SDOS CEA, FOR THE POINTS MENTIONNED ABOVE TAKING INTO ACCOUNT A PHANTOM.
2- IMPROVEMENT OF THE SENSOR TO OPTIMIZE THE RESPONSE THROUGH VARIOUS ACTIONS: A) IMPROVEMENT OF DIODE STRUCTURE IN THE PRESENTATION, B) IMPROVEMENT OF THE CONVERTER WHICH WILL BE ABLE TO BE USED WITH DIFFERENT DETECTORS, C) STUDY OF GAZ COUNTER, D) STUDY OF MULTIDETECTOR DEVICES (MICROELECTRONIC).
AT THE END OF THE 1992-1994 CONTRACT WE HOPE TO:
- GIVE PERFORMANCES AND LIMITATIONS OF THE "CONVERTER" + DIODE DEVICE - PROPOSE THE PRINCIPLE AND GIVE THE FAISABILITY OF NEW NEUTRON SENSOR(S) WE POINT OUT THAT THE FABRICATION OF A PERSONNAL NEUTRON DOSEMETER WILL PROBABLY NEED AN ULTERIOR STEP OF TECHNICAL DEVELOPMENT.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- natural sciences physical sciences theoretical physics particle physics neutrinos
- engineering and technology electrical engineering, electronic engineering, information engineering electronic engineering sensors
- natural sciences chemical sciences inorganic chemistry metalloids
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Coordinator
87060 Limoges
France
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