Naturally occurring radioactive material and risk assessment of tailings of polymetallic and Ra/U mines from legacy sites

被引：13

作者：

Paiva, Isabel ^{[1
,2
]}

Marques, Rosa ^{[1
]}

Santos, Marta ^{[1
,2
]}

Reis, Mario ^{[1
,2
]}

Prudencio, Maria Isabel ^{[1
]}

Waerenborgh, Joao Carlos ^{[1
]}

Dias, Maria Isabel ^{[1
]}

Russo, Dulce ^{[1
]}

Cardoso, Guilherme ^{[1
]}

Vieira, Bruno J. C. ^{[1
]}

Carvalho, Edgar ^{[3
]}

Rosa, Carlos ^{[4
]}

Lobarinhas, Daniela ^{[3
]}

Diamantino, Catarina ^{[3
]}

Pinto, Rui ^{[3
]}

机构：

[1] Univ Lisbon, Inst Super Tecn, Ctr Ciencias Tecnol Nucl C2TN, EN 10 Km 139-7, P-2695066 Bobadela, Portugal

[2] Univ Lisbon, Inst Super Tecn, LPSR, EN 10 Km 139-7, P-2695066 Bobadela, Portugal

[3] Empresa Desenvolvimento Mineiro SA EDM, Rua Sampaio & Pina 1,7, P-1070248 Lisbon, Portugal

[4] Univ Lisbon, Fac Ciencias, IDL, Ed C6, P-1749016 Lisbon, Portugal

来源：

CHEMOSPHERE | 2019年 / 223卷

关键词：

Old mine tailings; NORM; Gamma spectrometry; INAA; Mossbauer spectroscopy; Risk assessment; MILL TAILINGS; RARE-EARTH; URANIUM; RADIONUCLIDES; GEOCHEMISTRY; MINERALS; ELEMENTS; IRON;

D O I：

10.1016/j.chemosphere.2019.02.057

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Old mine tailings from Northern and Central Portugal were studied in order to perform a radiological and chemical characterization. The evaluation of massic activity of natural radionuclides and concentrations in tailings of polymetallic and Ra/U mines was performed by gamma spectrometry and neutron activation analysis. Iron speciation was carried out by Mossbauer spectroscopy. In polymetallic tailings with physical ore processing (Cumieira and Verdes - exploited for Sn, Nb-Ta) higher contents of Th, Ra-228 and Ra-226 in the coarser materials occur, probably due to their presence in host rock and ore fragments. In finer tailings, washing may explain the lower Ra-226 and Pb-210 massic activity. In tailings with physical/chemical ore processing (Covas - exploited for W and Sn) high U contents and a tendency for higher Ra-226 and Pb-210 massic activity in the fine materials is observed, probably due to their incorporation in nanosized particles of iron oxides. A high variation of the Pb-210/Ra-226 Ra ratio occurs in polymetallic tailings; a deficit of Pb-210 can be observed particularly in deposits of settling tanks drained from dumps of chemically treated ore. In Ervideira-Mestras tailings (Ra/U exploitation) where no ore process in situ was performed, a near equilibrium between Pb-210 and Ra-226 occurs. Dose risk assessment was carried out by calculating external outdoor Annual Effective Dose Rate; the dose rates in air due to terrestrial gamma radiation are low for the polymetallic tailings (<47 nGy/h), and higher for tailings of Rail) (up to 4130 nGy/h), in the worst scenario. (C) 2019 Elsevier Ltd. All rights reserved.

引用

页码：171 / 179

页数：9

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