Medição radiológica de níveis perigosos em telhas de construção no condado de Bungoma, Quênia
DOI:
https://doi.org/10.5935/jetia.v8i33.791Resumo
Vinte (20) diferentes azulejos locais e importados foram amostrados das principais ferragens em Bungoma. As amostras coletadas foram moídas separadamente, peneiradas, em malha de 0,5mm, secas a 110°C, pesadas e acondicionadas em frascos plásticos de 200ml tampados. As amostras foram carimbadas com números de identificação e mantidas por 30 dias para que o equilíbrio secular fosse alcançado entre a atividade do rádio 238U,232Th ,40K e sua progênie. A concentração média de atividade de 238U, 232Th e 40K foi de 109±5,48Bqkg-1, 11±0,55 Bqkg-1 e 1574±78,7 Bqkg-1, respectivamente. A taxa média de dose absorvida foi de 140±7,03 nGyh-1, que é maior do que o valor médio mundial de 60 nGyh-1. O equivalente médio de rádio foi de 288±14,44 Bqkg-1, que é inferior ao valor limite mundial de 370Bqkg-1. Os índices de risco externo e interno foram de 0,70±0,03 msvy-1 e 0,80±0,04 msvy-1, respectivamente. Portanto, as telhas amostradas usadas no município de Bungoma para construção têm ameaça radiológica mínima para a população.
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