International Journal of Science and Technology

International Journal of Science and Technology>> Volume 7, Number 6, June 2017

International Journal of Science and Technology


Gross Alpha and Beta Activity and Annual Committed Effective Doses due to Natural Radionuclides in some Medicinal Plants commonly used in Ghana

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Author L. Tettey-Larbi, E. O. Darko, C. Schandorf, A. A. Appiah, F. Sam, A. Faanu, 1 D. K. Okoh, H. Lawluvi, B. K. Agyeman, C. Kansaana, P. A. Amoah, R. K. Osei, R. Agalga, S. Osei
On Pages 232-244
Volume No. 3
Issue No. 4
Issue Date April, 2013
Publishing Date April, 2013
Keywords Medicinal Plants, Natural Radioactivity, Gross alpha and Beta Activity, Annual committed effective dose


Abstract

The average gross alpha and gross beta activities and the corresponding annual committed effective dose due to the major alpha and beta emitting radionuclides in the Uranium and Thorium series have been determine for nine different medicinal plants that are commonly used in Ghana using Canberra iMatic™ Automatic low background gas-less counter. Samples of the medicinal plants were obtained from the Centre for Scientific Research into Plant Medicine in Ghana and prepared using for different methods for analysis. The average gross alpha activity was found to be in the range of 11.73±0.61 Bq kg-1 to 132.67±7.22 Bq/kg in the raw sample of Lippia multiflora and the ethanol extraction sample of Alstonia boonei respectively. Likewise, the average gross beta activity was found to be in the range of 124.34±11.28 Bq/kg to 790.58±13.19 Bq/kg in the raw sample of Cassia sieberiana and the ethanol extraction sample of Nauclea latifolia. The average gross alpha activities were far less than the average gross beta activities in the samples. The activities increase across the various forms of sample preparation employed. That is average gross activity in Raw < Brewed < Infusion < Ethanol Extraction. All sample preparation methods of consumption except the ethanol extraction had average annual alpha and beta committed effective dose falling within the limit of average annual committed effective dose due to natural radiation which ranges between 0.2-0.8 mSv/yr with an average value of 0.3 mSv/yr

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