If you want to buy a source from another country in the EU, the supplier in that country will need you to get for them a standard form stamped by NRW before they can send you the source.
Sales and transfers of radioactive sealed sources between EU countries are subject to a simple notification/declaration procedure under Council Regulation 1493/93. The form simply confirms that you are entitled to possess such a source. The form may cover one or more shipments and they last up to 3 years. You can get a declaration form from the Waste Shipments Unit (WSU) in Natural Resources Wales, which you complete and return to them - see address below. There are no charges for this.
Some sealed sources are of such low activity that they are exempt, see Table 5 in Schedule 23 to the Environmental Permitting Regulations 2010 (as amended in 2011). For example a cobalt-60 source less than 100 kBq is exempt.
You can get the form from:
Waste Shipments Unit
Natural Resources Wales
St Mellons Business Park
Cardiff CF3 0EY
Tel: +44 (0)29 2024 5315 or 0300 065 3073
Fax: +44 (0)29 2036 2487