radioactive distribution

Objectives The variation of the size distribution of radioactive aerosols may cause a large fluctuation of lung dose caused by radon and its daughters.

天然放射性气溶胶粒径分布的变化会引起氡及其子体所致肺剂量的较大涨落。

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Radioactive elements of rocks in North China platform and the thermal structure and temperature distribution of the modern continental lithosphere

华北地台岩石放射性元素与现代大陆岩石圈热结构和温度分布

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In order to estimate the retention and residual quantity, it has to know the three-dimensional distribution of the radioactive source. But the y camera can only obtain the two-dimensional image.

但Y相机只能得到放射源的二维图像，而只有得到放射源的三维分布，才能实现对滞留量和残留量进行比较准确的估算。

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By this method, the spatiotemporal distribution of radioactive nuclides in atmosphere in different terrain characteristics, different weather situations for instantaneous or continuous leaking source were obtained, and the dry or wet deposition quantities on the ground were also acquired.

该方法可计算核事故中连续点源和瞬时点源在不同气象、地形条件下的浓度分布，并可获得地面的干沉积率和湿沉积率。

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It is concluded that the seismic-tectonic activity of the Huangling anticline area behave as whole and the tectonic process is under way in the depth of 15 ￣ 20 km as well as direction distribution of tensile stress axes appears radioactive from the centre of the anticline.

结果表明，黄陵背斜的地震构造活动具有整体性，构造过程发生在15～20km的深度，张应力轴的方向分布显示以背斜为中心的幅射状态。

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