Determination of dose equivalent and risk in thorium cycle
Description
In these report are presented the calculations of dose equivalent and risk, utilizing the dosimetric model described in publication 30 of the International Comission on Radiological Protection. This information was obtained by the workers of the thorium cycle, employed at the Praia and Santo Amaro Facilities, by assessing the quantity and concentration of thorium in the air. The samples and the number of measurements were established through design of experiments techniques, and the results were evaluated with the aid of variance analysis. The estimater of dose equivalent for internal and external radiation exposure and risk associated were compared with the maximum recommended limits. The results indicate the existence of operation areas whose values were above those limits, requiring so an improvement in the procedures and services in order to meet the requirements of the radiological protetion. (author)
Availability note (English)
MF available from INIS under the Report Number.Abstract (Portuguese)
Neste trabalho sao apresentadas as estimativas de dose equivalente efetiva e risco, para os trabalhadores do ciclo do torio, lotados nas instalacoes da Usina de Praia (Sao Joao da Barra, R.J.) e Usina Santo Amaro (Sao Paulo, S.P.), obtidas apos medidas de taxa de dose e concentracao de torio no ar, constantes do programa de monitoracao ocupacional de fiscalizacao do Instituto de Radioprotecao e Dosimetria, utilizando o modelo dosimetrico descrito na publicacao n0 30 da Comissao Internacional de Protecao Radiologica (ICRP). Os locais de amostragens e o numero de medidas foram estabelecidos por uma tecnica de planejamento estatistico e os resultados foram avaliados com o recurso da analise de variancia. As estimativas de dose equivalente efetiva, para exposicao interna e externa a radiacao, e o risco associado foram comparados com os limites maximos recomendados. Os resultados indicaram a existencia de areas de operacao que estao acima destes limites e que necessitam de melhorias nos procedimento e servico de protecao radiologica, para enquadrarem-se dentro das exigencias da protecao radiologica recomendadas. (autor)Files
21023802.pdf
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Additional details
Additional titles
- Original title (Portuguese)
- Determinacao de dose e risco no ciclo do torio
Publishing Information
- Imprint Pagination
- 96 p.
- Report number
- INIS-BR--1825
INIS
- Country of Publication
- Brazil
- Country of Input or Organization
- Brazil
- INIS RN
- 21023802
- Subject category
- S61: RADIATION PROTECTION AND DOSIMETRY;
- Resource subtype / Literary indicator
- Numerical Data, Thesis
- Descriptors DEI
- COMPARATIVE EVALUATIONS; DOSE EQUIVALENTS; MAXIMUM PERMISSIBLE DOSE; NUCLEAR FACILITIES; NUMERICAL DATA; PERSONNEL; RADIATION MONITORING; THORIUM; THORIUM CYCLE; X-RAY FLUORESCENCE ANALYSIS
- Descriptors DEC
- ACTINIDES; CHEMICAL ANALYSIS; DATA; ELEMENTS; EVALUATION; FUEL CYCLE; INFORMATION; METALS; MONITORING; NONDESTRUCTIVE ANALYSIS; SAFETY STANDARDS; X-RAY EMISSION ANALYSIS