AI Article Synopsis
- The study focuses on the re-emission process of tritiated water from soil, which is crucial for assessing tritium exposure near nuclear fusion sites.
- A field experiment used heavy water to simulate this process, measuring HDO concentrations in soil and how they change over time when exposed to HDO vapor.
- Results showed that HDO levels in the topsoil decreased rapidly, with exposed soil losing more HDO than mixed soil, and a model was developed to analyze and predict these concentration changes.
Article Abstract
The re-emission process of tritiated water (HTO) deposited on a soil surface is an important process to assess tritium doses to the general public around nuclear fusion facilities in future. A field experiment using heavy water (HDO) as a substitute for HTO was carried out in the summertime to investigate the re-emission process of HTO from soil to the atmosphere. In the experiment, the time variations of depth profiles of HDO concentrations in soil exposed to HDO vapour and soil mixed with HDO were measured during the re-emission process on the field. The HDO concentrations in soil water in top soil layers of both the exposed and mixed soil rapidly decreased with time during the re-emission. However, the decrease of exposed soil was much greater than that of mixed soil. The re-emission process was analysed using a model including the evaporation of HDO from soil, the exchange between soil HDO and air H2O, and the diffusion of HDO in soil. It was found that the model is applicable to calculating the time variations of detailed depth profiles of HDO concentration in soil water in surface soil layers, using an estimated exchange velocity.
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| http://dx.doi.org/10.1016/S0265-931X(03)00169-3 | DOI Listing |
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