In the previous paper, transportation of
90Sr which leached out from cemented solid into a model saturated stratum was experimentally discussed. In this paper, two kinds of techniques were examined for predicting the
90Sr distribution in a model stratum. The first technique consists of numerical solution of a transportation-diffusion equation, which describes the transportation phenomena of
90Sr in the stratum. The second one consists of time-transformation technique which predicts a
90Sr distribution in the stratum based on the distribution of a tracer of water such as tritiated water (HTO).
Some significant results have been obtained, such as that: (1) The first technique has, at present, some difficulties in predicting a
90Sr distribution. The difference between a predicted and an observed
90Sr distribution should be minimized through taking into consideration local disturbance of stratum characteristics. The mathematical model should also be cheacked on the usefulness for predicting the
90Sr distribution. (2) The
90Sr distribution predicted by using a HTO tracer test agree well with an observed distribution. It takes only about 1/50 of time which would be required for actual distribution of
90Sr in the stratum.
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