Radiological evaluation of Ra-226, Ra-228 and K-40 in tea samples: A comparative study of effective dose and cancer risk

Roberto Cruz da Silva; José Marques Lopes; Leandro Barbosa da Silva; Alessandro Mariano Domingues; Carla da Silva Pinheiro; Lucas Faria da Silva; Ademir Xavier da Silva

doi:10.1016/j.apradiso.2020.109326

Radiological evaluation of Ra-226, Ra-228 and K-40 in tea samples: A comparative study of effective dose and cancer risk

Appl Radiat Isot. 2020 Nov:165:109326. doi: 10.1016/j.apradiso.2020.109326. Epub 2020 Jul 23.

Authors

Roberto Cruz da Silva¹, José Marques Lopes², Leandro Barbosa da Silva³, Alessandro Mariano Domingues³, Carla da Silva Pinheiro⁴, Lucas Faria da Silva⁵, Ademir Xavier da Silva³

Affiliations

¹ Nuclear Engineering Department, Federal University of Rio de Janeiro, Av. Horácio Macedo, 2030, Bloco G, Sala 206 - CT, Fundão, 21945-970, Rio de Janeiro, RJ, Brazil. Electronic address: rcruz@con.ufrj.br.
² Geochemistry Department (Pospetro), Rua Barão de Jeremoabo, s/nº, 40170-110, Federal University of Bahia, Salvador, Brazil.
³ Nuclear Engineering Department, Federal University of Rio de Janeiro, Av. Horácio Macedo, 2030, Bloco G, Sala 206 - CT, Fundão, 21945-970, Rio de Janeiro, RJ, Brazil.
⁴ Brazilian Marine Corps Technological Center, Av. Brasil, Parada de Lucas, 13478, 21010-076, Rio de Janeiro, RJ, Brazil.
⁵ Chemistry School, Federal University of Rio de Janeiro, Av. Athos da Silveira Ramos, 149 - CT, Fundão, 21941-909, Rio de Janeiro, RJ, Brazil.

PMID: 32777740
DOI: 10.1016/j.apradiso.2020.109326

Abstract

Activity concentrations of tea samples were determined using high resolution gamma spectrometry.The values ranged from (421.00 ± 17.00) to (732.00 ± 30.00) Bq.kg ^-1 for K-40 and from (3.00 ± 0.80) to (27.00 ± 3.00) Bq.kg^-1 for Ra-228. The values for Ra-226 were below 27.00 Bq.kg^-1. The committed effective dose was estimated at 4.74-78.89 μSv.y^-1 for adults and 13.55-445.84 μSv.y^-1 for children. The cancer risk was higher for females. However, results showed that the tea consumption do not represent a radiological health risk to the population.

Keywords: Committed effective dose; Naturally occurring radionuclides; Tea consumption.

Publication types

Comparative Study

MeSH terms

Dose-Response Relationship, Drug
Humans
Neoplasms / etiology*
Potassium Radioisotopes / analysis*
Radium / analysis*
Tea / chemistry*

Substances

Potassium Radioisotopes
Radium-228
Tea
Radium-226
Radium