46 research outputs found

    Interaction of TIS and ST in environmental matters

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    The role of TIS concerning environmental matters in view of the SAPOCO 42 document will be tackled. Interactions between TIS and ST, as the Division managing water networks, ventilation systems and various potentially polluting installations, will be discussed both for the planning as well as for the operational phase. A systematic approach to the problem within the foreseen CERN-wide Environmental Management System will be described

    Rejets radioactifs et environnement du CERN en 2004

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    La radioactivitĂ© de l’environnement autour de l’Organisation EuropĂ©enne pour la Recherche NuclĂ©aire (CERN) et les doses de rayonnements qui en rĂ©sultent pour la population avoisinante sont contrĂŽlĂ©es par la Commission de SĂ©curitĂ© du CERN et de maniĂšre indĂ©pendante par les autoritĂ©s compĂ©tentes des deux États HĂŽtes, l’Institut de Radioprotection et de SĂ»retĂ© NuclĂ©aire (IRSN) cĂŽtĂ© France et l’Office FĂ©dĂ©ral de la SantĂ© Publique (OFSP) cĂŽtĂ© Suisse. Dans ce rapport, les rĂ©sultats de mesures concernent en particulier le territoire suisse. L’ensemble des mesures effectuĂ©es en 2004 prouve que le fonctionnement des installations du CERN Ă©tait sans consĂ©quence radiologique sur l’environnement et la population. Le contrĂŽle des Ă©missions montre que les rejets effectifs se situent Ă©galement en 2004 nettement en dessous des limites rĂ©glementaires. Ce constat est confirmĂ© par le contrĂŽle des immissions dans l’environnement. Le CERN a bien respectĂ© en 2004 comme dans les annĂ©es prĂ©cĂ©dentes la valeur directrice de dose liĂ©e Ă  la source fixĂ©e Ă  0.3 mSv/an. L’impact rĂ©el reprĂ©sente en fait moins de 5% de cette valeur, comme l’indique l’estimation pour le groupe de rĂ©fĂ©rence, qui est de l’ordre de 0.01 mSv/an

    Monte Carlo simulation of muon-induced background of an anti-Compton gamma-ray spectrometer placed in a surface and underground laboratory

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    Simulations of cosmic ray muon induced background of an HPGe detector placed inside an anti-Compton shield on the surface and in shallow underground is described. Investigation of several model set-ups revealed some trends useful for design of low-level gamma-ray spectrometers. It has been found that background spectrum of an HPGe detector can be scaled down with the shielding depth. No important difference is observed when the same set-up of the anti-Compton spectrometer is positioned horizontally or vertically. A cosmic-muon rejection factor of at least 40 (at around 1 MeV) can be reached when the anti-Compton suppression is operational. The cosmicmuon background can be reduced to such a level that other background components prevail, like those from the residual contamination of the detector and shield materials and/or from radon, especially for the underground facilities

    Rejets et environnement du CERN

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    La radioactivitĂ© de l’environnement autour de l’Organisation EuropĂ©enne pour la Recherche NuclĂ©aire (CERN) et les doses de rayonnements qui en rĂ©sultent pour la population avoisinante sont contrĂŽlĂ©es par la Commission de SĂ©curitĂ© du CERN et de maniĂšre indĂ©pendante par les autoritĂ©s compĂ©tentes des deux États HĂŽtes, l’Institut de Radioprotection et de SĂ»retĂ© NuclĂ©aire (IRSN) cĂŽtĂ© France et l’Office FĂ©dĂ©ral de la SantĂ© Publique (OFSP) cĂŽtĂ© Suisse (voire Chapitre 8.6). Dans ce rapport, les rĂ©sultats de mesures concernent en particulier le territoire suisse. L’ensemble des mesures effectuĂ©es en 2006 prouve que le fonctionnement des installations du CERN Ă©tait sans consĂ©quence radiologique sur l’environnement et la population. Le contrĂŽle des Ă©missions montre que les rejets effectifs se situent, Ă©galement en 2006, nettement en dessous des limites rĂ©glementaires. Ce constat est confirmĂ© par le contrĂŽle des immissions dans l’environnement. Le CERN a bien respectĂ© en 2006 comme dans les annĂ©es prĂ©cĂ©dentes la valeur directrice de dose liĂ©e Ă  la source fixĂ©e Ă  0.3 mSv/an. L’impact rĂ©el reprĂ©sente en fait seulement 2.5% de cette valeur, comme l’indique l’estimation pour le groupe de rĂ©fĂ©rence, qui est de l’ordre de 0.01 mSv/an

    Models for environmental impact assessments of releases of radioactive substances from CERN facilities

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    The document describes generic models for environmental impact assessments of releases of radioactive substances from CERN facilities. Except for few models developed in the Safety Commission, the models are based on the 1997 Swiss directive HSK-R-41 and on the 2001 IAEA Safety Report No. 19. The writing style is descriptive, facilitating the practical implementation of the models at CERN. There are four scenarios assumed for airborne releases: (1) short-term releases for release limit calculations, (2) actual short-term releases, (3) short-term releases during incidents/accidents, and (4) chronic long-term releases during the normal operation of a facility. For water releases, two scenarios are considered: (1) a release into a river, and (2) a release into a water treatment plant. The document shall be understood as a reference for specific environmental studies involving radioactive releases and as a recommendation of the Safety Commission

    Integrated Safety and Environment Group: Annual Report 2003

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    This report summarizes the main activities of the Integrated Safety and Environment (IE) Group of the Safety Commission (TIS) during the year 2003, and the results obtained. The different topics in which the group is active are covered: environment, quality management, safety training and major accidents follow-up

    Rejets radioactifs et environnement du CERN en 2003

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    La radioactivitĂ© de l’environnement autour de l’Organisation EuropĂ©enne pour la Recherche NuclĂ©aire (CERN) et les doses de rayonnements qui en rĂ©sultent pour la population avoisinante sont contrĂŽlĂ©es par la Commission de SĂ»retĂ© du CERN et de maniĂšre indĂ©pendante par les autoritĂ©s compĂ©tentes des deux Etats HĂŽtes, l’Institut de Radioprotection et de SĂ»retĂ© NuclĂ©aire (IRSN) cĂŽtĂ© France et l’Office FĂ©dĂ©ral de la SantĂ© Publique (OFSP) cĂŽtĂ© Suisse. Dans ce rapport, les rĂ©sultats de mesures concernent en particulier le territoire suisse. L’ensemble des mesures effectuĂ©es en 2003 prouve que le fonctionnement des installations du CERN Ă©tait sans consĂ©quence radiologique sur l’environnement et la population. Le contrĂŽle des Ă©missions montre que les rejets effectifs se situent Ă©galement en 2003 nettement en dessous des limites rĂ©glementaires. Ce constat est confirmĂ© par le contrĂŽle des immissions dans l’environnement. Le CERN a bien respectĂ© en 2003 comme dans les annĂ©es prĂ©cĂ©dentes la valeur directrice de dose liĂ©e Ă  la source fixĂ©e Ă  0.3 mSv/an. L’impact rĂ©el reprĂ©sente en fait moins de 10% de cette valeur, comme l’indique l’estimation pour le groupe critique, qui est de l’ordre de 0.03 mSv/an

    An actively vetoed Clover gamma-detector for nuclear astrophysics at LUNA

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    An escape-suppressed, composite high-purity germanium detector of the Clover type has been installed at the Laboratory for Underground Nuclear Astrophysics (LUNA) facility, deep underground in the Gran Sasso Laboratory, Italy. The laboratory gamma-ray background of the Clover detector has been studied underground at LUNA and, for comparison, also in an overground laboratory. Spectra have been recorded both for the single segments and for the virtual detector formed by online addition of all four segments. The effect of the escape-suppression shield has been studied as well. Despite their generally higher intrinsic background, escape-suppressed detectors are found to be well suited for underground nuclear astrophysics studies. As an example for the advantage of using a composite detector deep underground, the weak ground state branching of the Ep = 223 keV resonance in the 24Mg(p,gamma)25Al reaction is determined with improved precision.Comment: 8 pages, 6 figures, 3 tables; as accepted by Eur. Phys. J.

    New isotope technologies in environmental physics

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    As the levels of radionuclides observed at present in the environment are very low, high sensitive analytical systems are required for carrying out environmental investigations. We review recent progress which has been done in low-level counting techniques in both radiometrics and mass spectrometry sectors, with emphasis on underground laboratories, Monte Carlo (GEANT) simulation of background of HPGe detectors operating in various configurations, secondary ionisation mass spectrometry, and accelerator mass spectrometry. Applications of radiometrics and mass spectrometry techniques in radioecology and climate change studies are presented and discussed as well. The review should help readers in better orientation on recent developments in the field of low-level counting and spectrometry, and to advice on construction principles of underground laboratories, as well as on criteria how to choose low or high energy mass spectrometers for environmental investigations
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