Radioactivity and radiological risk associated with effluent sediment containing technologically enhanced naturally occurring radioactive materials in amang (tin tailings) processing industry

Ismail Bahari, Nasirian Mohsen, Md. Pauzi Abdullah

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

The processing of amang, or tin tailings, for valuable minerals has been shown to technologically enhance NORM and this has stirred significant radiological safety and health concerns among Malaysia's regulatory authority. A growing radiological concern is now focused on the amang effluent containing NORM in recycling ponds, since these ponds may be reclaimed for future residential developments. A study was carried out to assess the radiological risk associated with amang processing and the accumulated effluent in the recycling ponds. Twenty-six sediment samples from the recycling ponds of two amang plants in the states of Selangor and Perak, Malaysia, were collected and analyzed. The maximum activity concentrations of 238U, 226Ra, 232Th and 40K recorded in sediments from these ponds were higher than Malaysia's and the world's natural highest. Correspondingly, the mean radium equivalent activity concentration indices, Raeq, and gamma radiation representative level index, Iγr, were higher than the world's average. The enhancement of NORM in effluent sediments as a consequence of amang processing, and the use of a closed water management recycling system created Effective Dose Rates, E (nSv h-1), that signal potential environmental radiological risks in these ponds, should they be reclaimed for future land use.

Original languageEnglish
Pages (from-to)161-170
Number of pages10
JournalJournal of Environmental Radioactivity
Volume95
Issue number2-3
DOIs
Publication statusPublished - Jun 2007

Fingerprint

Radioactive materials
Tin
Radioactivity
Tailings
Ponds
tin
radioactivity
tailings
Effluents
Industry
Sediments
pond
Recycling
effluent
industry
Malaysia
recycling
Processing
sediment
Radiologic Health

Keywords

  • Amang
  • NORM
  • Radiological risk
  • Recycling pond
  • Sediment

ASJC Scopus subject areas

  • Environmental Science(all)

Cite this

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abstract = "The processing of amang, or tin tailings, for valuable minerals has been shown to technologically enhance NORM and this has stirred significant radiological safety and health concerns among Malaysia's regulatory authority. A growing radiological concern is now focused on the amang effluent containing NORM in recycling ponds, since these ponds may be reclaimed for future residential developments. A study was carried out to assess the radiological risk associated with amang processing and the accumulated effluent in the recycling ponds. Twenty-six sediment samples from the recycling ponds of two amang plants in the states of Selangor and Perak, Malaysia, were collected and analyzed. The maximum activity concentrations of 238U, 226Ra, 232Th and 40K recorded in sediments from these ponds were higher than Malaysia's and the world's natural highest. Correspondingly, the mean radium equivalent activity concentration indices, Raeq, and gamma radiation representative level index, Iγr, were higher than the world's average. The enhancement of NORM in effluent sediments as a consequence of amang processing, and the use of a closed water management recycling system created Effective Dose Rates, E (nSv h-1), that signal potential environmental radiological risks in these ponds, should they be reclaimed for future land use.",
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AB - The processing of amang, or tin tailings, for valuable minerals has been shown to technologically enhance NORM and this has stirred significant radiological safety and health concerns among Malaysia's regulatory authority. A growing radiological concern is now focused on the amang effluent containing NORM in recycling ponds, since these ponds may be reclaimed for future residential developments. A study was carried out to assess the radiological risk associated with amang processing and the accumulated effluent in the recycling ponds. Twenty-six sediment samples from the recycling ponds of two amang plants in the states of Selangor and Perak, Malaysia, were collected and analyzed. The maximum activity concentrations of 238U, 226Ra, 232Th and 40K recorded in sediments from these ponds were higher than Malaysia's and the world's natural highest. Correspondingly, the mean radium equivalent activity concentration indices, Raeq, and gamma radiation representative level index, Iγr, were higher than the world's average. The enhancement of NORM in effluent sediments as a consequence of amang processing, and the use of a closed water management recycling system created Effective Dose Rates, E (nSv h-1), that signal potential environmental radiological risks in these ponds, should they be reclaimed for future land use.

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