Factors Controlling Radionuclides Migration within Different Media
Karima Mahmoud Hussin Musa;
Abstract
This study is aimed to evaluate the activity concentrations and
assessment of radiation hazard indices and excess lifetime cancer risk
(ELCR), and to examine the mobility of uranium, thorium and their isotopes
and daughters during the acid leaching. In the same context the study of
the daughter / parent ratios in the three phases, original sample, leach
liquor and residue which gave a complete picture about the behavior
during weathering and alterations in twenty one sedimentary rock samples
obtained from three different localities named Wadi Nasab, Wadi Sad El
Banat and Wadi Um Hamd, southwestern Sinai, Egypt.
In the first stage; the natural radionuclides in the original samples have
been measured by using HPGe detector with a specially designed shield. The
work showed that the activity concentrations of 238U, 226R, 232Th and 40K
were higher than the world's average. The activity ratios 234U/238U,
230Th/238U, 230Th/234U, 226Ra/238U, 238U/235U and 234U/235U were studied to
estimate the radioactive equilibrium / disequilibrium in the three localities.
In the present work, the radium equivalent (Raeq) in Bq/Kg, external
hazard index (Hex), radioactivity level index (I γ), the absorbed dose rate (D)
and the annual effective dose (AED) in an outdoor environment were
estimated. The excess lifetime cancer risk (ELCR) was found to be high for
assessment of radiation hazard indices and excess lifetime cancer risk
(ELCR), and to examine the mobility of uranium, thorium and their isotopes
and daughters during the acid leaching. In the same context the study of
the daughter / parent ratios in the three phases, original sample, leach
liquor and residue which gave a complete picture about the behavior
during weathering and alterations in twenty one sedimentary rock samples
obtained from three different localities named Wadi Nasab, Wadi Sad El
Banat and Wadi Um Hamd, southwestern Sinai, Egypt.
In the first stage; the natural radionuclides in the original samples have
been measured by using HPGe detector with a specially designed shield. The
work showed that the activity concentrations of 238U, 226R, 232Th and 40K
were higher than the world's average. The activity ratios 234U/238U,
230Th/238U, 230Th/234U, 226Ra/238U, 238U/235U and 234U/235U were studied to
estimate the radioactive equilibrium / disequilibrium in the three localities.
In the present work, the radium equivalent (Raeq) in Bq/Kg, external
hazard index (Hex), radioactivity level index (I γ), the absorbed dose rate (D)
and the annual effective dose (AED) in an outdoor environment were
estimated. The excess lifetime cancer risk (ELCR) was found to be high for
Other data
| Title | Factors Controlling Radionuclides Migration within Different Media | Other Titles | العوامل الحاكمة علي النويدات المشعة المهاجرة داخل الأوساط المختلفة | Authors | Karima Mahmoud Hussin Musa | Issue Date | 2018 |
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