好东西，有些东西不敢挂出来啊，你懂的
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据说手不直接摸的话问题不大？
二次方反比定律，且需要参考源面积，比如1平方厘米的源，同样活度下和理想中的点源比，距离1cm以内时前者可以认为辐射无明显变化，而后者距离1mm比1cm辐射大100倍，所以比活度高的物质手持危害大，同活度下体积小的手持危害大，换句话说一大片的话手持也没太大压力。不过考虑辐射防护第一条——正当性。手持都是不值得的
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