Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 4 de 4
Filtrar
Mais filtros










Base de dados
Intervalo de ano de publicação
1.
Ann ICRP ; 48(4): 5-67, 2019 12.
Artigo em Inglês | MEDLINE | ID: mdl-31859526

RESUMO

The purpose of this publication is to provide guidance on radiological protection in industries involving naturally occurring radioactive material (NORM). These industries may give rise to multiple hazards and the radiological hazard is not necessarily dominant. The industries are diverse and may involve exposure of people and the environment where protective actions need to be considered. In some cases, there is a potential for significant routine exposure of workers and members of the public if suitable control measures are not considered. Releases of large volumes of NORM may also result in detrimental effects on the environment from radiological and non-radiological constituents. However, NORM industries present no real prospect of a radiological emergency leading to tissue reactions or immediate danger for life. Radiological protection in industries involving NORM can be appropriately addressed on the basis of the principles of justification of the actions taken and optimisation of protection using reference levels. An integrated and graded approach is recommended for the protection of workers, the public, and the environment, where consideration of non-radiological hazards is integrated with radiological hazards, and the approach to protection is optimised (graded) so that the use of various radiological protection programme elements is consistent with the hazards while not imposing unnecessary burdens. For workers, the approach starts with characterisation of the exposure situation, and integration, as necessary, of specific radiological protective actions to complement the protection strategy already in place or planned to manage other workplace hazards. According to the characteristics of the exposure situation and the magnitude of the hazards, a relevant reference level should be selected and appropriate collective or individual protective actions taken. Exposure to radon is also treated using a graded approach, based first on application of typical radon prevention and mitigation techniques, as described in Publication 126. A similar approach should be implemented for public exposure through the control of discharges, wastes, and residues after characterisation of the situation. If the protection of non-human species is warranted, it should be dealt with after an assessment of radiological exposure appropriate for the circumstances, taking into account all hazards and impacts. This should include identification of exposed organisms in the environment, and use relevant derived consideration reference levels to inform decisions on options for control of exposure.


Assuntos
Exposição Ocupacional/prevenção & controle , Exposição à Radiação/prevenção & controle , Lesões por Radiação/prevenção & controle , Proteção Radiológica/métodos , Humanos
2.
Sci Total Environ ; 272(1-3): 3-7, 2001 May 14.
Artigo em Inglês | MEDLINE | ID: mdl-11379925

RESUMO

Possibilities for harmonising controls on the radioactivity of building materials within the European Union are being discussed in a Working Party on Natural Radiation Sources established by the Article 31 Group of Experts (Euratom Treaty). The Working Party is preparing a document to aid the Article 31 Expert Group and the European Commission in considering possible recommendations and technical guidance to the Member States for the implementation of the new Basic Safety Standards Directive concerning the radioactivity of building materials. The discussions in the working party have demonstrated several challenges in the possible harmonisation of controls, many of them arising from some significant differences in national circumstances.


Assuntos
Materiais de Construção/normas , Poluentes Radioativos/normas , Poluentes Radioativos do Ar/efeitos adversos , Poluentes Radioativos do Ar/análise , Poluentes Radioativos do Ar/normas , Poluição do Ar em Ambientes Fechados/efeitos adversos , Poluição do Ar em Ambientes Fechados/análise , Materiais de Construção/efeitos adversos , Materiais de Construção/análise , Exposição Ambiental , União Europeia , Raios gama/efeitos adversos , Humanos , Poluentes Radioativos/efeitos adversos , Poluentes Radioativos/análise , Radônio/efeitos adversos , Radônio/análise , Radônio/normas
3.
J Nutr ; 125(3 Suppl): 757S-770S, 1995 03.
Artigo em Inglês | MEDLINE | ID: mdl-7884562

RESUMO

Because many Western diseases are hormone-dependent cancers, we have postulated that the Western diet, compared with a vegetarian or semi-vegetarian diet, may alter hormone production, metabolism or action at the cellular level. Recently, our interest has been focused on the cancer-protective role of some hormone-like diphenolic phytoestrogens of dietary origin, the lignans and isoflavonoids. The precursors of the biologically active compounds originate in soybean products (mainly isoflavonoids but also lignans), as well as whole grain cereals, seeds, probably berries and nuts (mainly lignans). The plant lignan and isoflavonoid glycosides are converted by intestinal bacteria to hormone-like compounds with weak estrogenic and antioxidative activity; they have now been shown to influence not only sex hormone metabolism and biological activity but also intracellular enzymes, protein synthesis, growth factor action, malignant cell proliferation, differentiation and angiogenesis, making them strong candidates for a role as natural cancer protective compounds. Epidemiological investigations support this hypothesis, because the highest levels of these compounds are found in countries or regions with low cancer incidence. This report is a review of results that suggest that the diphenolic isoflavonoids and lignans are natural cancer-protective compounds.


Assuntos
Dieta/normas , Estrogênios não Esteroides , Estrogênios/administração & dosagem , Glycine max/química , Neoplasias/prevenção & controle , Animais , Antineoplásicos/farmacologia , Antineoplásicos/normas , Antineoplásicos/uso terapêutico , Estrogênios/análise , Estrogênios/metabolismo , Feminino , Humanos , Incidência , Isoflavonas/administração & dosagem , Isoflavonas/análise , Isoflavonas/metabolismo , Lignanas/administração & dosagem , Lignanas/análise , Lignanas/metabolismo , Masculino , Neoplasias/dietoterapia , Neoplasias/epidemiologia , Fitoestrógenos , Preparações de Plantas , Fatores de Risco
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA
...