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    Wyświetlanie 1-5 z 5
    Tytuł:
    Elliptic flow at RHIC with NeXSPheRIO
    Autorzy:
    Andrade, R.
    Grassi, F.
    Hama, Y.
    Kodama, T.
    Socolovski Jr., O.
    Tavares, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/148386.pdf
    Data publikacji:
    2006
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    elliptic flow
    relativistic heavy-ion collisions
    quark-gluon plasma
    Opis:
    Elliptic flow at RHIC is computed event-by-event with NeXSPheRIO. Reasonable agreement with experimental results on v2(h) is obtained. Various effects are studied as well: reconstruction of impact parameter direction, freeze-out temperature, equation of state (with or without crossover), emission mechanism.
    Źródło:
    Nukleonika; 2006, 51,suppl.3; 17-20
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Radiation-induced cancer risk and decision-making in a simulated Cs-137 urban event
    Autorzy:
    Andrade, Edson R.
    Gomes, Renato G.
    Stenders, Ricardo
    Brum, Tercio
    Lima, Sergio X.
    Castro, Mariana S. C.
    Silva, Ademir X.
    Powiązania:
    https://bibliotekanauki.pl/articles/146858.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    environmental contamination
    dispersive device
    decision-making
    Opis:
    The triggering of a “dirty bomb” generates a complex scenario, with enormous challenges for the responders due to initial misinformation and the urgency to act quickly yet effectively. Normally, the first 100 h are decisive for perceiving the risk in a more realistic dimension, but the support of methodologies that rely on computational simulations can be valuable when making key decisions. This work seeks to provide support for the early decision-making process by using a Gaussian model for the distribution of a quantity of Cs-137 spread by a radiological dispersive device (RDD). By sequentially joining two independent programs, HotSpot Health Physics codes and RESidual RADiation (RESRAD)-RDD family of codes, we came up with results that suggest a segmented approach to the potentially affected population. These results advocate that (a) the atmospheric stability conditions represented by the Pasquill–Gifford classes and (b) the population subgroups defi ned by radiation exposure conditions strongly influence the postdetonation radiological effects. These variables should be taken into account in the elaboration of flexible strategies that include many climatic conditions and to prioritize attention to different groups of public at risk. During the initial phases of such an event, it is believed that simulations using Gaussian models may be of value in anticipating the possible changes in key variables during the decision-making process. These variables may severely affect the effectiveness of the actions of responders and the general public’s safety.
    Źródło:
    Nukleonika; 2020, 65, 1; 37-43
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cost-effective approach to lung cancer risk for a radiological dispersal device (RDD) scenario
    Autorzy:
    Costa, Karolina P. S.
    Lima, Sergio X.
    Brum, Tercio
    Lima, Zelmo R.
    Amorim, Jose C. C.
    Healy, Matthew J. F.
    Vital, Helio C.
    Prah, Matjaž
    Andrade, Edson R.
    Powiązania:
    https://bibliotekanauki.pl/articles/146560.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    environment
    contamination
    radiation
    cost-effectiveness
    risk
    Opis:
    A release of radioactive material into the environment can lead to hazardous exposure of the population and serious future concerns about health issues such as an increased incidence of cancer. In this context, a practical methodology capable of providing useful basic information from the scenario can be valuable for immediate decisions and future risk assessment. For this work, the simulation of a radiological dispersal device (RDD) filled with americium-241 was considered. The radiation dose simulated by the HotSpot code was used as an input to the epidemiological equations from BEIR V producing the data used to assess the risk of lung cancer development. The methodology could be useful in providing training for responders aimed to the initial support addressed to decision-making for emergency response at the early phase of an RDD scenario. The results from the simulation allow estimating (a) the size of the potentially affected population, (b) the type of protection action considering gender and location of the individuals, (c) the absorbed doses, (d) the matrix of lung cancer incidence predictions over a period of 5 years, and (e) the cost-effectiveness in the initial decision environment.
    Źródło:
    Nukleonika; 2019, 64, 4; 123-129
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulated nuclear contamination scenario, solid cancer risk assessment, and support to decision
    Autorzy:
    Lima, Sergio X.
    Costa, Karolina P. S.
    Lima, Zelmo R.
    Rother, Fagner C.
    Araujo, Olga M. O.
    Vital, Helio C.
    Brum, Tercio
    Junior, Wilson F. R. S.
    Amorim, Jose Carlos C.
    Healy, Matthew J. F.
    Andrade, Edson R.
    Powiązania:
    https://bibliotekanauki.pl/articles/146554.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    improvised nuclear device
    IND
    induced cancer
    risk assessment
    decision
    ocena ryzyka
    decyzja
    Opis:
    The detonation of an (hypothetical) improvised nuclear device (IND) can generate atmospheric release of radioactive material in the form of particles and dust that ultimately contaminate the soil. In this study, the detonation of an IND in an urban area was simulated, and its effects on humans were determined. The risk of solid cancer development due to radiation was calculated by taking into account prompt radiation and whole-body exposure of individuals near the detonation site up to 10 km. The excess relative risk (ERR) of developing solid cancer was evaluated by using the mathematical relationships from the Radiation Effects Research Foundation (RERF) studies and those from the HotSpot code. The methodology consists of using output data obtained from simulations performed with the HotSpot health physics code plugging in such numbers into a specific given equation used by RERF to evaluate the resulting impact. Such a preliminary procedure is expected to facilitate the decision-making process significantly.
    Źródło:
    Nukleonika; 2019, 64, 2; 41-48
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of an irradiation system for a small size continuous run multipurpose gamma irradiator
    Autorzy:
    Calvo, W. A. P.
    Rela, P. R.
    Napolitano, C. M.
    Kodama, Y.
    Omi, N. M.
    da Costa, F.
    de Andrade e Silva, L. G.
    Powiązania:
    https://bibliotekanauki.pl/articles/148041.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    multipurpose irradiator
    gamma irradiator
    compact irradiator
    cobalt-60 irradiator
    gamma facility
    Opis:
    The Radiation Technology Center from IPEN-CNEN/SP, Brazil, developed a revolutionary design and national technology, a small-sized continuous run and multipurpose industrial gamma irradiator, to be used as a demonstration facility for manufacturers and contract service companies, which need economical and logistical in-house irradiation system alternatives. Also, to be useful for supporting the local scientific community on development of products and process using gamma radiation, assisting the traditional and potential users on process validation, training and qualification of operators and radioprotection officers. The developed technology for this facility consists of a continuous tote box transport system, comprising a single concrete vault, where the automated transport system of products inside and outside of the irradiator utilizes a rotating door, integrated with the shielding, avoiding the traditional maze configuration. Covering 76 m2 of floor area, the irradiator design is a product overlap sources and the maximum capacity of cobalt-60 wet sources is 37 PBq. The performed qualification program of this multipurpose irradiator was based on AAMI/ISO 11137 standard, which recommends the inclusion of the following elements: installation and process qualification. The initial load of the multipurpose irradiator was 3.4 PBq with 13 cobalt-60 sources model C-188, supplied by MDS Nordion – Canada. For irradiator dose optimization, the source distribution was done using the software Cadgamma developed by IPEN-CNEN/SP. The polymethylmetacrylate (PMMA) dosimeter system, certified by the International Dose Assurance Service (IDAS) of the International Atomic Energy Agency (IAEA) was used for irradiator dose mapping. The economic analysis, performance concerning with dose uniformity and cobalt-60 utilization efficiency were calculated and compared with other commercial gamma irradiators available on the market.
    Źródło:
    Nukleonika; 2009, 54, 2; 93-97
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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