Concentration of Ra in soil, water, and sediment of active and abandoned quarries in southern Vietnam and environmental risk assessment: experimental and modeling studies.

Open-pit mining disturbs the earth's surface, impacts geological characteristics, and releases many pollutants including heavy metals, radionuclides, and poisonous gases into the environment. This study investigated the difference between the activity levels of Ra radionuclide in the abandoned quarry region (region A) and the active quarry region (region B). In the surface soil, the mean values of activity concentrations were 40 Bq kg and 55 Bq kg in region A and region B, respectively.

Treatment for removing radium in soil and groundwater.

The results of Ra activity concentration measurements in 50 soil and groundwater samples in Ninh Son region, Vietnam were evaluated in the present study. Average activity concentration in the soils was significantly higher than the worldwide average concentration in soils published by UNSCEAR, 2008. 90% of groundwater samples had concentrations of Ra that were higher than the USEPA drinking water standard.

Uranium isotopes in groundwater in Ho Chi Minh City and related issues: Health risks, environmental effects, and mitigation methods.

Groundwater is regularly used for many purposes, such as drinking and agricultural irrigation systems. Still, it contains high levels of radionuclides (e.g.

Accumulation rates of natural radionuclides (K, Pb, Ra, U, and Th) in topsoils due to long-term cultivations of water spinach (Ipomoea Aquatica Forssk.) and rice (Oryza Sativa L.) based on model assessments: A case study in Dong Nai province, Vietnam.

In topsoils, the activity concentrations of natural radionuclides (hereafter NRs) increase due to the addition of NRs from fertilizers, irrigation water, and air dust pollution. On the other hand, various physical-chemical and environmental processes such as radioactive decay, volatilization, leaching, erosion, and plant uptake were responsible for the decrease of the activity concentrations of NRs in the topsoils. In this study, behaviours of K, Pb, Ra, U, and Th in topsoils were modelled by the CEMC soil model and the HYDRUS-1D model.

Levels of Ra in groundwater samples collected in Phu Yen province, Vietnam associated with health risks to local population and impacts on the maize (Zea mays L.) soil.

Groundwater is a major source of drinking water and agricultural water in some regions of the world. However, it contains a high level of Ra that is potentially hazardous to human health and the environment. Normally, the activity concentration of Ra in groundwater is determined to assess the quality of groundwater that can be used as drinking water.

The effects of some soil characteristics on radon emanation and diffusion.

The effects of moisture content, grain size, temperature, major elemental composition, and the pH of soils on the radon emanation and diffusion coefficients were evaluated in this study. The emanation and diffusion coefficients are strongly influenced by moisture content and grain size. The radon emanation coefficient increased and the diffusion coefficient decreased with decreasing particle size.

Modelling the mitigation speeds of Cs, Sr and I in the topsoils and assessment of the radiological hazards.

Fate modelling of artificial radionuclides (ARs) in top soils are necessary to assess the radiological effects to population. Among ARs, Cs, Sr and I are very important since the large abundances in the environment. In this study, the fates of Cs, Sr and I in the surface soil layers were simulated by the soil model which was developed by the Canadian Centre for Environmental Modelling and Chemistry (CEMC).

Soil radon gas in some soil types in the rainy season in Ho Chi Minh City, Vietnam.

Field experiments on soil radon and radium concentrations were carried out in eighteen locations in Ho Chi Minh City, Vietnam. Soil radon depth profiles (10-100 cm) of loam, sand and clay soil samples in the rainy season were measured using RAD7 radon detector. Mean concentrations of Rn and Ra were found to be 28.

Radon and radium concentrations in drinkable water supplies of the Thu Duc region in Ho Chi Minh City, Vietnam.

The results of (222)Rn and (226)Ra activity measurements in drinkable water supplies of the Thu Duc region in Ho Chi Minh City, Vietnam, are presented in this paper. The measurements were performed using a RAD 7 radon detector manufactured by Durridge Company, Inc. Mean concentrations of (222)Rn and (226)Ra were found to be 0.