EXTERNAL EXPOSURE ASSESSMENT IN DWELLING BUILT WITH PHOSPHOGYPSUM / Avaliação da exposição externa em residência construída com fosfogesso

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

In this study it was evaluated the viability of the use of phosphogypsum plates as a building material in the dwelling construction. Thus, the effective dose due to external gamma exposure was assessed through the 226Ra, 232Th, 210Pb e 40K activity concentration in phosphogypsum plates. Samples of this material were analyzed by high resolution gamma spectrometry for their natural radionuclide activity concentration. The radium equivalent activity and external and internal hazard indices were also calculated. The plates were made with phosphogypsum from fertilizer industries located in Cajati, Cubatão and Uberaba. The samples were identified according to phospogypsum origin, Cajati (CA), Cubatão (CT) and Uberaba (UB). The activity concentrations results varied from 15.9 to 392 Bq kg -1 for 226Ra, 26.1 to 253 Bq kg-1 for 232Th, and 27.4 to 852 Bq kg-1 for 210Pb. The results of 40K were lower than 81 Bq kg-1. The annual effective dose was obtained through the dosimetric model with reference standard room concept, the results were 0.02 mSv y-1 for a house built with phosphogypsum from origin CA, 0.2 mSv y-1 for CT phosphogypsum and 0.14 mSv y-1 for UB phosphogypsum, everything the effective doses were below 1 mSv y-1, an annual effective dose limit for public exposure by International Commission on Radiological Protection.

ASSUNTO(S)

fosfogesso espectrometria gama exposição externa fosfogesso espectrometria gama exposição externa

ACESSO AO ARTIGO

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