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Natural radioactivity in building materials, indoor radon measurements, and assessment of the associated risk indicators in some localities of the Centre Region, Cameroon

Abstract: The objective of the current study is to investigate the natural radioactivity of some building materials, the resulting long-term external and internal effective dose equivalents (EEDE and IEDE) analysis followed by indoor radon measurements, and the assessment of some radiological risk indicators associated with radon exposure. A total of 37 samples of building materials were analyzed with a sodium iodide detector (NaI (Tl)), and the computer code RESRAD-BUILD was used for the analysis of the EEDE and IEDE of the structural elements of the houses (walls and floor). For indoor radon measurements, 140 houses were selected, and in each of them was placed 01 RADTRAK dosimeter. Inhalation dose, total dose, and some radiological risk indicators were calculated. The specific activities of 226Ra, 232Th, and 40K for the overall sampled building materials were found to vary between 10 ± 2-52 ± 7, 10 ± 1-95 ± 10, and 31 ± 1-673 ± 20 Bq kg-1, respectively. The dwelling types with bare brick walls, cement mortar plastered walls, and concrete floors show EEDE and IEDE values well below the recommended limits. The corresponding dwelling type contributions to the measured average indoor radon concentration (42 ± 12 Bq m-3) are 22%, 13%, and 16%, respectively. Inhalation dose resulting from the measured indoor radon concentrations varies from 0.35 to 3.24 mSv y-1 with a mean value of 0.96 ± 0.55 mSv y-1, which represents about 65% of the total dose simulated (1.49 ± 0.88 mSv y-1) by the RESRAD-BUILD code. The overall analysis of indoor radon-related radiological risk indicators shows low levels of risk relative to permissible limits.

 Authorship: Joseph Emmanuel Ndjana Nkoulou, André Manga, Saïdou, Olga German, Carlos Sainz Fernandez y Moïse Godfroy Kwato Njoc

 Fuente: Environ Sci Pollut Res Int . 2022 Aug;29(36):54842-54854

 Publisher: Springer Science + Business Media

 Year of publication: 2022

 No. of pages: 13

 Publication type: Article

 DOI: 10.1007/s11356-022-19781-z

 ISSN: 0944-1344,1614-7499

 Publication Url: https://doi.org/10.1007/s11356-022-19781-z

Authorship

NDJANA NKOULOU II, JOSEPH EMMANUEL

MANGA, ANDRÉ

SAÏDOU

GERMAN, OLGA

KWATO NJOCK, MOÏSE GODFROY