Realistische Neutronenkalibrierfelder und zugehoerige dosimetrische Mengen^FP2-RADPROT 7C, Bestimmung und Realisierung von Kalibrierfeldern fuer die Neutronenschutzdosimetrie

Description: Im Rahmen dieses Projektes sollten charakteristische Parameter von Neutronenfeldern bestimmt werden, die an Arbeitsplaetzen in kerntechnischen Anlagen angetroffen werden, um vergleichbare Kalibrierfelder im Laboratorium zu erzeugen. Aus diesem Grunde wurden zunaechst die fuer diese Untersuchungen benoetigten Neutronenspektrometer entwickelt, spezifiziert und dann an Arbeitsplaetzen eingesetzt. Die ermittelten Neutronenspektren wurden zusammen mit aelteren Literaturdaten in einem neuen Katalog zusammengestellt und analysiert. Um radionuklid- und beschleunigergestuetzte Neutronenquellen wurden verschiedene Moderatorsysteme konzipiert und rechnerisch optimiert, um typische Arbeitsplatzspektren im Kalibrierlaboratorium zu simulieren. Das Projekt wurde mit zusaetzlichen Aufgaben und neuem Foerderkennzeichen weitergefuehrt.

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Origins: /Bund/UBA/UFORDAT

Tags: Messgerät ? Neutronenstrahlung ? Dosimetrie ? Kalibrierung ? Kerntechnische Anlage ? Radionuklid ? Spektralanalyse ? Strahlendosis ? Arbeitsplatz ? Laborversuch ? Kenngröße ? Kalibrierfelder ? Neutronenfelder ? Spektrum ? Strahlenfelder ?

Region: Niedersachsen

License: cc-by-nc-nd/4.0

Language: Deutsch

Organisations

• Commissariat a l'Energie Atomique Fontenay aux Roses (Mitwirkende)
• Department of Industry, National Physical Laboratory (Mitwirkende)
• GSF - Forschungszentrum für Umwelt und Gesundheit GmbH, Institut für Strahlenschutz (ISS) (Mitwirkende)
• Kommission der Europäischen Gemeinschaften Brüssel (Geldgeber*in)
• Kommission der Europäischen Gemeinschaften, Generaldirektion XII Wissenschaft, Forschung und Entwicklung (Mitwirkende)
• Physikalisch-Technische Bundesanstalt (Betreiber*in)
• Umweltbundesamt (Bereitsteller*in)

Time ranges: 1990-07-01 - 1992-06-30

Alternatives

• Language: Englisch/English
  Title: Determination and Realisation of Calibration Fields for Neutron Protection Dosimetry as Derived from Spectra Encountered in Routine Surveillance
  Description: Objective: The objective of this collaborative project is to produce, in the laboratory, a few well characterized neutron fields that replicate typical spectral neutron fluence distributions encountered in radiation protection practice. These fields are needed for the calibration of neutron area and personnel dose meters which generally do not have the energy response required to determine dose equivalent quantities. General Information: The project consists of four distinct parts: the measurement of the spectral neutron fluence typically encountered in practice; the preparation of a catalogue of all measured spectra in an agreed format including the calculation of relevant dose equivalent quantities and the response of commonly used neutron dose meters; the inspection of this catalogue in order to extract a few representative spectra and their expansion in terms of the calibration spectra already available or, if necessary, newly defined ones; .SP 0 the computational prediction of configurations consisting of the usual neutron sources (accelerator, reactor or radionuclide based) and appropriate moderators in order to produce these reference fields in the laboratory. Four European laboratories, well experienced in the field of neutron metrology and dosimetry, will cooperate in this project. Spectrometric measurements will be performed independently by each laboratory, chiefly in their own country. Setting up and analysis of the catalogue, however, require a close cooperation. Achievements: A database of neutron spectra measured around nuclear installations has been compiled together with protection-level instrument response functions and conversion factors from neutron to dosimetric quantities. A computer program has been written to handle these data. Based on this collection of workplace spectra it is planned to develop realistic calibration fields for performing improved instrument calibrations. This approach will overcome the problem that exists at present with the calibration of neutron protection level instruments, arising from the poor dosimetric response of these instruments, which results in all measurements made with them having substantial uncertainties. New data to be included in a European neutron spectra database were obtained from various French nuclear installations, using the Bonner sphere technique and proton recoil spectrometry. A new unfolding code has been written for use with the NE213 spectrometer. It incorporates a determination of the efficiency including the irradiation geometry and a detection threshold, and the use of a trapezoidal shape for the response function to correct the measured proton distribution, and it replaces the differentiation technique by a convolution product. The results have been checked against calibrated sources. The main characteristics (calibration curves, efficiency, energy resolution) of SP2 proportional counters have been redetermined. This reduces the systematic discrepancy between ... https://ufordat.uba.de/UFORDAT/pages/PublicRedirect.aspx?TYP=PR&DSNR=47097

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