Natural radioactivity and external dose rates in tailing samples from Rosterman gold mine, Kakamega county, Kenya

Conrad Khisa Wanyama; John Wanjala Makokha; Fred Wekesa Masinde; Michael Nakitare Waswa

doi:10.5935/jetia.v6i26.718

Autores

Conrad Khisa Wanyama Departamento de Ciência, Tecnologia e Engenharia, Universidade Kibabii, P.O BOX 1699-50200, Bungoma, Quênia http://orcid.org/0000-0002-3624-7756 (não autenticado)
John Wanjala Makokha Departamento de Ciência, Tecnologia e Engenharia, Universidade Kibabii, P.O BOX 1699-50200, Bungoma, Quênia http://orcid.org/0000-0003-3267-4512 (não autenticado)
Fred Wekesa Masinde Departamento de Ciências Físicas, Universidade de Kabianga, P.O BOX 2030-20200, Kericho, Quênia http://orcid.org/0000-0002-5025-9534 (não autenticado)
Michael Nakitare Waswa Departamento de Ciência, Tecnologia e Engenharia, Universidade Kibabii, P.O BOX 1699-50200, Bungoma, Quênia http://orcid.org/0000-0003-2479-862X (não autenticado)

DOI:

https://doi.org/10.5935/jetia.v6i26.718

Resumo

Neste artigo, foram avaliados os resultados documentados das concentrações de radionuclídeos naturais nos rejeitos da mina de ouro Rosterman, no condado de Kakamega, no Quênia. Trinta amostras de rejeitos da mina de ouro de Rosterman foram coletadas de acordo com os procedimentos de amostragem padrão e foram analisadas para 238U, 232Th e 40K por espectroscopia de raios gama NaI (TI). As atividades de 238U, 232Th e 40K variaram de 39 ± 1,63 Bq / Kg a 118 ± 4,43 Bq / Kg, 72 ± 2,24 Bq / Kg a 223 ± 8,36 Bq / Kg e 85 ± 3,6 Bq / Kg a 362 ± 10,65 Bq / Kg respectivamente. Atividades equivalentes de rádio foram encontradas abaixo de 370 Bq / Kg em todas as amostras coletadas. As taxas de dose gama externa estimadas a partir dos níveis de radionuclídeos nos sedimentos variaram de 32 ± 3,4 nGy / h a 68 ± 5,83 nGy / h. Portanto, a mineração de ouro em Rosterman tem implicações mínimas significativas para a saúde da população em geral e dos mineradores.

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