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自行设计了测量花岗岩近表层１２５Ｉ活度的装置，给出了１２５Ｉ表面活度测定结果、表面活度分布曲线、表面活度等值曲线，并且对结果进行了讨论。结果表明：活度测定的误差在规定的精度内，测量装置可行。
The device for measuring the activity of 125I near the surface of granite was designed by ourselves. The measured results of 125I surface activity, the surface activity distribution curve and the surface activity curve were given and the results were discussed. The results show that the error of activity measurement is within the specified accuracy and the measuring device is feasible.