The European Group for Blood and Marrow Transplantation (EBMT) has alerted 500 bone marrow transplant centres and 3,000 medics to be ready to treat Japanese radiation victims if such a situation arises.
The centres have plans and protocols for such an eventuality in place, though each centre will decide whether to take on patients individually.
EBMT president Alejandro Madrigal said that the group has asked centres about their level of response and capacity to assist, to assess their level of commitment.
EBMT nuclear accident committee chair Ray Powles said that between 20 and 30 workers at the Fukushima plant may need treatment, and that EBMT has contacted Japan directly and offered its services through the World Health Organization.
The treatment for patients with radiation exposure is supportive care to manage the damaging effects of exposure, while a few may need bone marrow transplants.