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Ra, [sup.228]Ra and [sup.228]Ra/[sup.226]Ra in surface marine sediment of Malaysia

Surface sediment samples were collected at the West (east coast and west coast of Peninsular Malaysia) and East (Sabah and Sarawak) Malaysia in several expeditions within August 2003 until June 2008 for determining the level of natural radium isotopes. Activity concentrations of [sup.226]Ra and [sup...

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Bibliographic Details
Published in:Journal of radioanalytical and nuclear chemistry 2013-02, Vol.295 (2), p.1465
Main Authors: Yii, Mei-Wo, Wan-Mahmood, Zal Uyun
Format: Article
Language:English
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Summary:Surface sediment samples were collected at the West (east coast and west coast of Peninsular Malaysia) and East (Sabah and Sarawak) Malaysia in several expeditions within August 2003 until June 2008 for determining the level of natural radium isotopes. Activity concentrations of [sup.226]Ra and [sup.228]Ra in surface marine sediment at 176 sampling stations were measured. The activity concentrations of both radionuclides in Malaysia (East and West Malaysia) display varied with the range from 9 to 158 Bq/kg dry wt. and 13 to 104 Bq/kg dry wt., respectively. Meanwhile, the ratio distributions of [sup.228]Ra/[sup.226]Ra were ranged from 0.62 to 3.75. This indicated that the ratios were slightly high at west coast of Peninsular Malaysia compared to other regions (east coast of Peninsular Malaysia, Sabah and Sarawak). The variation of activity concentrations of [sup.226]Ra and [sup.228]Ra and its ratios were also supported by the statistical analyses of one-way ANOVA and t test at 95 % confidence level, whereby there were proved that the measured values were different between the regions. These different were strictly related to their half-life, potential input sources (included their parents, [sup.238]U and [sup.232]Th), parent's characteristic, the geological setting/formation of the study area, environment origin and behavior. Keywords [sup.228]Ra * [sup.226]Ra * Activity ratio * Distribution * Surface marine sediment
ISSN:0236-5731
DOI:10.1007/s10967-012-2280-2