Not directly answering your question, but on preventing emission in the first place (and the best video I've ever seen on electrical engineering): https://www.youtube.com/watch?v=ySuUZEjARPY
Lots of very useful information here, thanks for the link! Actually there's some answer: as someone else already wrote in this thread, shields of cables must be soldered to the Faraday cage to prevent leakage.