Radiação Ultravioleta para a Inativação de Microrganismos em Ambientes Públicos

Luciano Bachmann; Gilberto Ubida Leite Braga

doi:10.29384/rbfm.2022.v16.19849001605

Autores

Luciano Bachmann Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo https://orcid.org/0000-0001-6622-251X
Gilberto Ubida Leite Braga https://orcid.org/0000-0002-4787-4704

DOI:

https://doi.org/10.29384/rbfm.2022.v16.19849001605

Palavras-chave:

Radiação Ultravioleta, Inativação de vírus, Inativação de bactérias, descontaminação de ambientes

Resumo

O objetivo deste estudo é implantar e caracterizar radiometricamente um sistema de irradiação de ambientes empregando-se lâmpadas de radiação ultravioleta do tipo C (UV-C) como alternativa para o controle da propagação de microrganismos. A pandemia de Covid-19 (Coronavirus disease 2019) tornou necessário o emprego de medidas sanitárias para conter a propagação do SARS-CoV-2 (Severe Acute Respitatory Syndrome Coronavirus) na população. Dar-se-á destaque, neste trabalho, ao sistema de segurança e à radiometria, visando à inativação dos microrganismos e o limite de exposição do público. Foram instaladas 3 lâmpadas de UV-C de 30 W numa sala de aula de 49 m². Os resultados mostram valores de densidade de potência superiores a 0,0129 mW cm^-2 na sala. O tempo de exposição necessário para a inativação dependerá da resistência intrínseca de cada microrganismo e do percentual de inativação desejado. O sistema proposto é uma estratégia sanitária adicional para conter a dispersão, não apenas do coronavírus SARS-Cov-2, mas também de outros microrganismos patogênicos, demonstrando que a radiação UV-C pode ser utilizada como uma importante ferramenta para controle de epidemias.

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