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The activity concentrations of gamma emitting radionuclides were measured in surface soil samples from the Thrace region. 232Th, 238U, 226Ra, 40K and 137Cs activities and physico-chemical parameters of the soil samples were determined in samples collected from 73 sampling stations. Radionuclide concentrations measured were compared with those found...
Il rapporto tecnico presenta l’attività svolta da ENEA nell’ambito del benchmark NEA del gruppo AFCS finalizzata alla validazione della procedura adottata per i calcoli del rateo di dose di un elemento di combustibile irraggiato e poi lasciato decadere per 1,8 anni. I valori di rateo di dose misurati sperimentalmente rispetto a cui si è operato il...
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... Generally, it detected at erosion sites with lower concentrations than at accretion sites except at E_R and W_B. (Degerlier, 2012). UNSCEAR (1993 and2000) mentioned that the sources of radiation could vary from place to place but the dose rate generally falls between 80 and 150 nGy/hr world over which is higher than the average value of the present work. ...
The Nile Delta coast is highly active dynamical coastal processing area. The investigation of gamma emitters of the surface sediments collected from Nile Delta coastal profiles revealed that the distribution of the detected natural radioactive materials is dependent mainly on the coastal processes. The average concentrations of 226Ra, 232Th and 40K in the Nile Delta coastal profiles were 23.78±8.54, 23.95±11.79 and 280.93±68.19 Bq/kg, respectively. These average values are lower than the worldwide averages but still within its ranges. The concentrations of the heavy radionuclides 226Ra and 232Th were found higher in erosion sites compared with the accretion ones. On the other hand, the light radionuclide 40K was behave as reverse as the heavy radionuclides that its concentration values detected at the erosion sites were lower than at the accretion ones. Radium equivalent index calculation indicated that all the sediments under investigation can use safely as building materials. The average of the outdoor gamma dose rate was 37.25±9.58 nGy/h and the annual external effective dose was 0.05±0.01 mSv/y and these values were in agreement with the corresponding values at different parts of the world. The distribution of the detected natural radionuclides and grain size in the coastal sediments at surf, breaker and offshore zones and their correlations has been discussed.
The purpose of this work was to investigate the correlation between concentrations of radon (²²²Rn) and radium (²²⁶Ra) in soil and to estimate the potential natural radiation hazard indices in Southern Thailand, Songkhla province, Namom district. In this study, the concentration of radon was measured by RTM1688-2 radon monitor and radium content was made using a high-resolution gamma spectrometer. A positive correlation coefficient between exhaled radon in soil gas and radium concentrations has been observed. Average concentrations of ²²⁶Ra, ²³²Th and ⁴⁰K in soil samples were (108 ± 26), (114 ± 22) and (1081 ± 278) Bq kg⁻¹, respectively. These values were used to estimate the radiological health hazard indices using standard analytical methods. The estimated absorbed dose rate, annual effective dose equivalent, gamma radiation hazard index and excess lifetime cancer risk are higher than world permissible limit. These values show a significant health risk due to radiation pollution in Southern Thailand.
