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Radiation Emergencies
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Disasters

Radiation Emergencies

Radiation emergencies involve exposure to large amounts of energy, which can result in severe health consequences if not managed properly.

Overview

Radiation is a type of energy. While people are exposed to small amounts of radiation daily from sources like sunlight, a radiation emergency involves much larger quantities.

Causes of Radiation Emergencies

A radiation emergency could be caused by the following:

  • Dirty bombs: A mix of explosives with radioactive powder.
  • Fallout: Radioactive material resulting from a nuclear bomb.
  • Accidental release: Incidents occurring at a nuclear reactor or a nuclear weapons plant.

Health Effects

Exposure to a large amount of radiation over a short period can cause burns or radiation sickness. If the exposure is significant enough, it can lead to premature aging or even death.

Preparedness and Coping

Although there are no guarantees of safety during a radiation emergency, you can take actions to protect yourself. You should have a disaster plan; being prepared can help reduce fear, anxiety, and losses. If you do experience a disaster, it is normal to feel stressed, and you may need help finding ways to cope.

Source: Centers for Disease Control and Prevention

Frequently Asked Questions

Self-decontamination removes up to 90% of external radioactive material. Before entering a clean shelter or clean living space, carefully remove your outer layer of clothing, turning it inside out to trap particles, and seal it in a plastic bag placed far away from people and pets. Wash your body thoroughly using warm water and mild soap, washing from head to toe to prevent spreading contaminants to mucous membranes. Shampoo your hair thoroughly, but do not use hair conditioner, as its chemical properties can bind radioactive particles to hair protein. Avoid scrubbing roughly or scratching, which can break the skin barrier and allow radioactive particles into the bloodstream.
cute Radiation Syndrome (ARS) occurs when a person is exposed to high doses of penetrating radiation over a short period. Early symptoms, called the prodromal phase, typically develop within minutes to several days depending on the dose. These include nausea, vomiting, loss of appetite, watery diarrhea, headache, and skin erythema resembling a severe sunburn. The faster symptoms appear after exposure, the higher the received radiation dose. Over subsequent weeks, ARS progresses to damage the bone marrow and gastrointestinal tract, leading to severe immune suppression, bleeding, and life-threatening infections. Anyone experiencing these symptoms following a known or suspected exposure requires immediate emergency medical evaluation.
In an area with radioactive fallout, only consume foods and liquids stored in airtight containers, such as sealed cans, jars, and commercially bottled water that were kept indoors during the event. Before opening any food package, can, or bottle, thoroughly wipe the outside of the container with a damp cloth to prevent radioactive dust on the exterior from contaminating the contents. Avoid tap water, uncovered cisterns, fresh garden vegetables, and locally produced dairy until health authorities monitor municipal supplies and declare them safe, as municipal filtration systems may not immediately filter all radioactive isotopes.
Potassium iodide (KI) protects only one organ, the thyroid gland, and only against one specific radioactive isotope: radioactive iodine (iodine-131). It provides zero protection against external radiation or other dangerous isotopes such as cesium or strontium. KI works by flooding the thyroid with stable iodine so that radioactive iodine cannot be absorbed, significantly lowering the long-term risk of radiation-induced thyroid cancer. It should strictly be taken under the direction of public health officials because improper use can trigger adverse effects, including thyroiditis, allergic reactions, and gastrointestinal upset, especially in older adults or individuals with pre-existing thyroid conditions.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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