Radioactivity distribution of thorium in sediment core of the Sabah-Sarawak coast

Zal U Yun Wan Mahmood, Zaharudin Ahmad, Mohd Izwan Abd Adziz, Che Abd. Rahim Mohamed, Abdul Kadir Ishak

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Thorium activity concentrations were measured in seven marine sediment cores taken from Sabah-Sarawak coast on 2004 by using a gravity box corer. Collected sediments were generally homogenous mud which contained much more mixture of silt and clay compared to sand and relatively low content of organic carbon (i.e. less than 5% at all sampling stations). The results found that activity concentrations of 230Th, 232Th and ratios of 230Th/232Th were ranged from 6.5-20.4 Bq/kg dry wt., 6.8-27.8 Bq/kg dry wt. and 0.69-0.92, respectively. It seem that, 232Th activity concentrations are slightly higher than 230Th at all sampling stations and both radionuclides were generally high at Sabah compared to Sarawak coastal waters. 230Th activity concentrations in sediment core appear to be correlated with the activity concentrations of 232Th at some sampling station. These indicating both radionuclides were supplied from the same of environment and source origin of detrital from terrestrial and shallower water. The low 230Th/ 232Th activity ratio which is less than unity suggesting that 232Th was actively and rapidly regenerated compared to 230Th from 234U. It also can be attributed to less efficiently scavenge of 230Th onto particles prior deposited at the marine sediment bed.

Original languageEnglish
Pages (from-to)365-372
Number of pages8
JournalJournal of Radioanalytical and Nuclear Chemistry
Volume285
Issue number2
DOIs
Publication statusPublished - Aug 2010

Fingerprint

Thorium
Malaysia
Radioactivity
Coastal zones
Sediments
Geologic Sediments
Sampling
Radioisotopes
Water
Silt
Gravitation
Organic carbon
Clay
Sand
Carbon

Keywords

  • Th
  • Th/Th
  • Th
  • Distribution
  • Marine sediment core
  • Sabah-Sarawak coast
  • Variation

ASJC Scopus subject areas

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

Cite this

Radioactivity distribution of thorium in sediment core of the Sabah-Sarawak coast. / Wan Mahmood, Zal U Yun; Ahmad, Zaharudin; Adziz, Mohd Izwan Abd; Mohamed, Che Abd. Rahim; Ishak, Abdul Kadir.

In: Journal of Radioanalytical and Nuclear Chemistry, Vol. 285, No. 2, 08.2010, p. 365-372.

Research output: Contribution to journalArticle

Wan Mahmood, Zal U Yun ; Ahmad, Zaharudin ; Adziz, Mohd Izwan Abd ; Mohamed, Che Abd. Rahim ; Ishak, Abdul Kadir. / Radioactivity distribution of thorium in sediment core of the Sabah-Sarawak coast. In: Journal of Radioanalytical and Nuclear Chemistry. 2010 ; Vol. 285, No. 2. pp. 365-372.
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