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Naturally occurring radioactive materials in bracelets and necklaces: radiological risk evaluation

Hassan, Halmat Jalal and Hashim, Suhairul and Abu Hanifah, Noor Zati Hani and Ghoshal, Sib Krishna and Mohd. Sanusi, Mohamad Syazwan and Suhailin, Fariza Hanim and Abdul Hadi, Muhammad Fahmi Rizal and Mohd. Tahar, Rozman and Bradley, David Andrew (2021) Naturally occurring radioactive materials in bracelets and necklaces: radiological risk evaluation. International Journal of Environmental Research and Public Health, 18 (21). pp. 1-11. ISSN 1661-7827


Official URL: http://dx.doi.org/10.3390/ijerph182111170


A particular category of jewelry is one involving bracelets and necklaces that are deliberately made to contain naturally occurring radioactive material (NORM)—purveyors making unsubstan-tiated claims for health benefits from the release of negative ions. Conversely, within the bounds of the linear no-threshold model, long-term use presents a radiological risk to wearers. Evaluation is conducted herein of the radiological risk arising from wearing these products and gamma-ray spectrometry is used to determine the radioactivity levels and annual effective dose of 15 commer-cially available bracelets (samples B1 to B15) and five necklaces (samples N16 to N20). Various use scenarios are considered; a Geant4 Monte Carlo (Geant4 MC) simulation is also performed to validate the experimental results. The dose conversion coefficient for external radiation and skin equivalent doses were also evaluated. Among the necklaces, sample N16 showed the greatest levels of radioactivity, at 246 ± 35, 1682 ± 118, and 221 ± 40 Bq, for238 U,232 Th, and40 K, respectively. For the bracelets, for238 U and232 Th, sample B15 displayed the greatest level of radioactivity, at 146 ± 21 and 980 ± 71 Bq, respectively. N16 offered the greatest percentage concentrations of U and Th, with means of 0.073 ± 0.0002% and 1.51 ± 0.0015%, respectively, giving rise to an estimated annual effective dose exposure of 1.22 mSv, substantially in excess of the ICRP recommended limit of 1 mSv/year.

Item Type:Article
Uncontrolled Keywords:bracelets, Geant4 MC, necklaces, NORMs
Subjects:Q Science > QC Physics
ID Code:95405
Deposited By: Yanti Mohd Shah
Deposited On:31 May 2022 20:37
Last Modified:31 May 2022 20:37

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