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Article
Activity Concentrations and Associated Gamma Doses of 238U and 235U in Jordan
Author(s)
ABDUL-WALI M. S. AJLOUNI
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DOI:10.17265/2159-5348/2015.05.007
Affiliation(s)
Department of Forensic Chemistry College of Forensic Sciences Naif Arab University for Security Sciences (NAUSS) P.O.Box: 6830, Riyadh, 11452, Kingdom of Saudi Arabia
ABSTRACT
In this study, sixteen soil and vegetable samples from Tafila district were collected and analyzed from eight locations. Measurements of specific activity of natural gamma emitter radionuclides, 238U and 235U, in these samples using gamma spectrometry, with the help of Genie 2000 software. Measurements were used to calculate the soil-vegetable transfer factor, and then the external radiation dose and internal radiation dose due to radioactivity of the ingested food. The specific activity of 238U and 235U in soil were found to vary from (in Bq/kg): 26-575 and 1.4-35.5, respectively. The specific activity of 238U and 235U in vegetables were found to vary from (in Bq/kg): 0.019 to 0.632 and 0.0013-0.0375, respectively. The calculated transfer factor of 238U and 235U range from 5.9 × 10-4 to 14.6 × 10-4 for 238U and 4.9 × 10-4 to 16.1 × 10-4 for 235U. External absorbed dose rates were calculated to be in the range from 12.42 to 266.00 nGy/h. The annual effective dose was found to vary from 28.94 to 619.78 μSv/y. The annual internal effective dose due to 238U and 235U for fresh weights of vegetables, were found to vary from 0.9 × 10-3 to 35.1 × 10-3 μSv/y for 238U and 0.61 × 10-4 to 17.62 × 10-4 μSv/y for 235U.
KEYWORDS
Soil, vegetables, gamma spectrometry, environmental radioactivity, Tafila, Jordan, transfer factor, internal dose, external dose.
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