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Radiation Protection Dosimetry Advance Access originally published online on October 6, 2005
Radiation Protection Dosimetry 2006 118(4):440-447; doi:10.1093/rpd/nci355
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Published by Oxford University Press (2006)

Gamma-emitting radionuclides in the shallow marine sediments off the Sindh coast, Arabian Sea

M. Akram1, Riffat M. Qureshi2,*, Nasir Ahmad3 and Tariq Jamal Solaija1

1 Ishfaq Ahmad Research Laboratories, P.O. Box 2151, Islamabad, Pakistan
2 Pakistan Institute of Nuclear Science and Technology, Nilore, Islamabad, Pakistan
3 Directorate of Research and Development, University of The Punjab, Lahore, Pakistan

* Corresponding author: riffat{at}pinstech.org.pk

Received August 18, 2005, amended September 6, 2005, accepted September 10, 2005

Determination of gamma emitting radionuclides in shallow marine sediments off the Sindh coast has been carried out using a gamma spectrometry technique. The activity concentration measured in various sediment samples off the Sindh coast has been found to vary from 15.93 ± 5.22 to 30.53 ± 4.70 Bq kg–1 for 226Ra, from 11.72 ± 1.22 to 33.94 ± 1.86 Bq kg–1 for 228Ra and from 295.22 ± 32.83 to 748.47 ± 28.75 Bq kg–1 for 40K. The calculated mean values of radium equivalent activity, absorbed dose rate and effective dose are 98 Bq kg–1, 49 nGy h–1 and 0.06 mSv y–1, respectively. No artificial radionuclide was detected in the samples measured from the study area. As no data on radioactivity of the coastal environment of Pakistan are available, the data presented here will serve as baseline information on radionuclide concentration in shallow sea sediments off the Sindh coast. The data will also be useful for tracking pollution inventories from unusual radiological events (if any) in the territorial waters of the study area. Further, the information presented will contribute to modelling of a regional radioactivity database from the perspectives of the International Atomic Energy Agency's Asia-Pacific Marine Radioactivity Database and Global Marine Radioactivity Database.


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