请问工业焊接探伤使用伽马射线，多远的距离比较安全，土壤植物水源等是否也会被辐射，从而对人体有害？ 伽马射线安全距离是多少
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射线和阳光、灯光一样是电磁波，所以不会有残留，也就不会出现经由土壤植物水源等间接危害人体的情况，这一点完全不用担心。
伽马射线！？会不会变绿巨人啊？
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