CERN gets 1.2 Billion Swiss Francs of funding a year, which is almost entirely spent on the experiments, so their office buildings are hardly ever renovated, which becomes apparent in small details like these.
The Synchro-Cyclotron (SC) accelerator, CERN's first particle accelerator, built in 1957. It could speed up particles to energies of about 600 MeV (Megaelectronvolts). For comparison, today's Large Hadron Collider (LHC) can speed up particles to about 6.8 TeV (Teraelectronvolts).
Today, the SC is a visitors center. Because it's not worth it to check every part of the room for radioactive contamination from the experiments, they just put up a warning sign that there might still be radiation.
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