High-level natural radionuclides from the Mandena deposit, South Madagascar

Duong Van Hao, Chau Nguyen Dinh, Paweł Jodłowski, Tibor Kovacs

Research output: Contribution to journalArticle

2 Citations (Scopus)


The 238 U, 226 Ra and 232 Th contents of six samples from the Mandena black sand placer deposit were determined by gamma-ray spectrometry and varied from 2280 to 4600 Bq/kg, 1530 to 2900 Bq/kg and 11,600 to 25,400 Bq/kg, respectively. The activity concentration of 232 Th is significantly higher than 238 U and there is no equilibrium between 238 U and 226 Ra. Due to the gamma interferences at the line 1461 keV and very high 228 Ac activity, the 40 K was calculated through potassium analyzed using ICP-AES and varied from 1 to 19 Bq/kg. The calculated gamma absorbed dose rate ranged from 7700 to 16,700 nGy/h.

Original languageEnglish
Pages (from-to)1331-1338
Number of pages8
JournalJournal of Radioanalytical and Nuclear Chemistry
Issue number3
Publication statusPublished - Mar 15 2019


  • Beach black sand
  • Disequilibrium
  • Gamma-ray spectrometry
  • High content of thorium and uranium
  • Interfering peaks

ASJC Scopus subject areas

  • Analytical Chemistry
  • Nuclear Energy and Engineering
  • Radiology Nuclear Medicine and imaging
  • Pollution
  • Spectroscopy
  • Public Health, Environmental and Occupational Health
  • Health, Toxicology and Mutagenesis

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