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Emergency crews are carrying out a training exercise at a busy A&E department today.
The operation is taking place at Maidstone Hospital and is simulating a radiation incident.
Emergency responders from the police, ambulance and fire service are practicing a co-ordinated response.
A&E doctors are also involved in the response at the site in Hermitage Lane, Barming.
A hospital spokesman said: "We are working with our partners from the emergency services to test some plans.
"This is a routine exercise and not in response to a specific threat.
"Our staff undertake regular training for emergencies during the year and is important they work with emergency services to be ready in the event of a real incident."