Thanks for the responses so far, especially the reference to the Health Protection agency which I had already contacted but was awaiting a reply and similarly with the British Dental Association.
I just wondered if anyone had any personal experience of dealing with dental practices on a regular basis. My own understanding is that modern digital x-ray equipment probably wouldn’t require lead lined doors but the customer (dentist) thinks they are probably required. While we would be happy to quote for the supply and fix of lead lined fire resisting doors what is the point if they aren’t really necessary.
In this case I have doubts as to whether the practise has appointed a suitably qualified radiological protection adviser as is required by law and are relying on outdated information. No doubt that if lead lined doors will be required they will also need to address the issues of shielding with regard to floors, walls and ceilings. Some of the consulting rooms are on the first floor, the building is a converted three storey house and some of the walls on the upper floors are lath and black mortar construction.