Radiological hazard indices and elemental composition of Brazilian and Swiss ornamental rocks

Hajj, Thammiris El; Silva, Paulo Sérgio Cardoso da; Gandolla, Mauro; Dantas, Gabriel Alencar Silva Almeida; Santos, A M; Junior, Homero Delboni

doi:10.15392/bjrs.v5i2.269

Braz. J. Rad. Sci.

2017

DOI: 10.15392/bjrs.v5i2.269

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Radiological hazard indices and elemental composition of Brazilian and Swiss ornamental rocks

Thammiris El Hajj¹,

Paulo Sérgio Cardoso da Silva²,

Mauro Gandolla³

et al.

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Cited by 2 publications

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“…Mean radon levels and standard deviation in mine O.Polytechnique in Lausanne (Switzerland). This research series introduced to Brazil equipment and techniques for the study and detection of this radioactive gas (Delboni Júnior et al 2014,Francisca 2014, Lima 2014, El Hajj et al 2016.…”

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confidence: 99%

Radon in Brazilian underground mines

Silva¹,

Eston²,

Iramina³

et al. 2018

J. Radiol. Prot.

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Radon is a chemically inert noble radioactive gas found in several radioactive decay chains. In underground mines, especially those that contain or have contained ores associated with uranium-bearing minerals, workers might be exposed to high levels of radon and its decay products (RDP). This work aims to investigate whether the exposure of workers to radon gas and its progeny has been evaluated in Brazilian non-uranium and non-thorium underground mines. Any such results and control measures undertaken or recommended to maintain concentrations under Brazilian occupational exposure limits (OELs) are documented. The methodology we adopted consists of three main phases. The first was an extensive bibliographical survey of the concentration levels of radon and RDP, as well as the radiation dose estimates, considering measurements made heretofore by various Brazilian researchers and exhibiting original measurement work undertaken by the one of the authors (mine O). In the second phase, the values obtained were compared with OELs. In the third phase, any control measures undertaken in mines with high exposure of workers to radon and its progeny were verified, and the adopted controls were determined. Radon concentration data obtained from 52 campaigns in 40 underground mines were analyzed. The results show that assessment of the exposure of workers to radon and its progeny was undertaken in many mines at least once, and that radon levels in 62.5% of the mines, when visited for the first time, were below the Brazilian OELs. As expected, the main control measure adopted or recommended was improvement of the ventilation system.

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Radon in Brazilian underground mines

Silva¹,

Eston²,

Iramina³

et al. 2018

J. Radiol. Prot.

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Activity concentration of natural radionuclides (238U, 226Ra, 232Th, 228Ra and 40K) in lettuce cultivated in soil amended with niobium tailings

Ayllon,

Torrecilla,

Saueia

et al. 2024

J Radioanal Nucl Chem

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Radiological hazard indices and elemental composition of Brazilian and Swiss ornamental rocks

Cited by 2 publications

References 27 publications

Radon in Brazilian underground mines

Radon in Brazilian underground mines

Activity concentration of natural radionuclides (238U, 226Ra, 232Th, 228Ra and 40K) in lettuce cultivated in soil amended with niobium tailings

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