In recent years a number of accidents have occurred that show the necessity to be prepared for a possible large-scale radiological accident or a terrorist attack, where the casualties will be members of the public. The accident may likely have an international scale and the radiation exposure can range from very low to substantial. An important initial step in the medical response to large-scale radiological accident is the triage of patients according to the severity of exposure. Here, an essential tool of doses assessment is biological dosimetry. It allows confirming or rejecting the doses suggested by the clinical triage. In Europe there are several laboratories with considerable experience in biological dosimetry. Each laboratory can easily perform biological dose assessment for incidents involving a few people. However, in a large-scale radiological accident or terrorist outrage the number of people that may need to be screened could easily exceed the capacity of a single laboratory. Hence, there is an urgent need to develop a European network of laboratories involved in biological dosimetry in order to be prepared for a radiological mass casualty. It should be mentioned that biodosimetry networking has already been recognised as a sensible and worthwhile emergency response capability in several regions of the world (USA, South America, Canada, Japan), however, not in Europe. The objectives of this CSA-SA is to define the framework of a NoE in biological dosimetry and to perform a feasibility study to determine its viability. The final report will be accompanied by statements of intent from the key organisations committing themselves to sustainable integration of their research in the area of biological dosimetry. The report will form the background to the consideration of including such a topic in a subsequent EURATOM WP with the expectation that a credible proposal would be received