Accidents can be limited to a plant/on-site or can extend to an off-site or a transport accident involving radioactive materials on road, radiological emergency may occur in the public domain. In case of exposure of people to ionizing radiation in a radiological emergency, provision for medical care including administration of antidotes should exist or be arranged immediately to reduce the consequence. Hence a doctor or a medical practitioner should have to be aware of the details of the medical care and antidotes (e.g. amyl nitrite, sodium nitrite) applicable during such a situation. Also he should be aware of the requirement of periodic replacement of antidotes and medicines where applicable and ensure that only valid non-expired medicines/antidotes are used. If a radiological emergency situation arises in a hospital or a nuclear medicine facility, a doctor of that facility has to be aware of his role in that situation. The following page provides information relevant to such an emergency and required preparedness in nuclear medicine facility: