The Warning Non-ionising Radiation No Entry 7592 sign will only permit people into this type of area that have the relevant authorisation. This will help to keep the non-trained personnel out and safe.
If you display this sign in a position that can be viewed easily by everyone, you should find that this strict instruction is well respected. People should usually realise that this rule is for their own safety and protection.
Fixing requires anything as simple as sticky pads, 'No-nails' type adhesive or double-sided tape.