One of the big detectors which record these collisions, they didn't think there was technology that could withstand the radiation that would be created in the LHC, so there was basically a lump of lead in the middle of this object with some detectors around the outside, but subsequently we have developed technology.
衝突を記録する 大きな検出器がありますが LHCで生成される放射能に 耐えるような技術は ないと考えられていました それで基本的には 中心に鉛の塊があって 周りに検出器が あるような感じですが 追々技術を 開発していったんです