Nuclear Blast Injuries — Types & First Aid

A nuclear detonation produces injuries unlike any other mass-casualty event. Survivors within the affected zone may face four simultaneous categories of trauma — blast wave, thermal, radiation, and projectile — often in combination. Understanding each type and knowing how to prioritise care can mean the difference between survival and preventable death when professional medical help is hours or days away.

This guide addresses what trained civilians can do in the immediate aftermath of a nuclear event, with the understanding that access to hospitals and emergency services may be severely limited.

The Four Categories of Nuclear Blast Injury

1. Blast Wave Injuries (Primary Blast)

The detonation creates an instantaneous pressure wave — a wall of compressed air travelling faster than sound — followed immediately by a powerful suction wave. This dual pressure change causes characteristic injuries to air-filled structures in the body.

Barotrauma is the defining injury of the primary blast wave:

• Tympanic membrane (eardrum) rupture — the most common blast injury; ears bleed, hearing loss is sudden and severe, ringing (tinnitus) is intense. Rupture occurs at overpressures as low as 5 psi. It is painful but rarely life-threatening alone.
• Blast lung — the most lethal primary blast injury. Overpressure ruptures alveoli and small vessels. The patient may appear symptom-free or mildly short of breath immediately after the blast, then deteriorate rapidly over 24–48 hours as blood fills the lung tissue (pulmonary contusion and haemorrhage). Do not assume a person is uninjured because they are walking and talking.
• Hollow organ rupture — the intestines, bowel, and bladder are vulnerable. Bowel rupture causes severe abdominal pain, guarding, and fever. Bladder rupture presents as blood in the urine and lower abdominal pain.

WARNING — Blast Lung: A person who was close to a detonation and is now breathing normally may have blast lung. They can deteriorate suddenly. Keep them at rest, do not exert them, and monitor breathing closely. Exertion accelerates pulmonary haemorrhage.

2. Thermal Injuries (Flash Burns)

The detonation fireball radiates an intense thermal pulse lasting 1–3 seconds (longer for larger weapons). This is not fire in the conventional sense — it is a direct radiative heat transfer that causes flash burns on any exposed skin facing the fireball.

Flash burn severity by distance (approximate, 10-kiloton airburst):

Distance from Detonation	Thermal Injury to Exposed Skin
0.5 km	Third-degree burns (full thickness) — unsurvivable without major medical care
1.0 km	Second-degree burns (blistering) — survivable with care
1.5 km	First-degree burns (redness, pain) — painful but survivable
2.0+ km	Minimal thermal injury if skin not exposed

Key factors affecting thermal injury: clothing (offers significant protection), whether the person was facing the fireball, reflective surfaces in the environment, and any intervening structures.

3. Projectile Injuries (Secondary and Tertiary Blast)

The blast wave accelerates debris — glass, masonry, metal, wood — to lethal velocities. This secondary fragmentation kills and injures at distances well beyond the direct thermal and pressure zones. Broken glass from windows can be propelled at speeds sufficient to penetrate skin and organs at 1–2 km.

Tertiary blast injury occurs when the blast wind physically throws people, causing blunt trauma from the impact.

4. Radiation Injuries — Acute Radiation Syndrome

Acute Radiation Syndrome (ARS) occurs when the body receives a whole-body dose above approximately 1 Gray (1 Gy). It is a systemic, dose-dependent illness.

ARS timeline:

Phase	Onset	Duration	Signs
Prodromal	30 min – 6 hrs	Hours to 2 days	Nausea, vomiting, headache, fatigue — begins sooner with higher dose
Latent	After prodromal	Days to weeks	Apparent improvement — deceptively asymptomatic
Manifest illness	After latent	Days to weeks	Bone marrow failure, infections, bleeding, hair loss
Recovery or death	—	Weeks to months	Dose-dependent outcome

WARNING — Dose Indicator: Nausea and vomiting beginning within 1 hour of exposure suggests a very high dose (≥ 3 Gy) and a serious prognosis. Vomiting beginning after 2–6 hours suggests a moderate dose. No vomiting within 24 hours suggests a low dose with generally good prognosis.

Triage in a Nuclear Mass Casualty Event

Conventional triage categories are modified for nuclear mass casualty events. The sheer number of casualties and the limitation of resources requires difficult decisions.

Modified nuclear triage categories:

1. Immediate (Red) — survivable injuries requiring urgent intervention; moderate blast or thermal injuries, early ARS with moderate dose
2. Delayed (Yellow) — serious but stable injuries; can wait hours for treatment
3. Minimal (Green) — walking wounded; minor injuries, low radiation dose; can assist others
4. Expectant (Black) — injuries incompatible with survival given available resources; very high radiation dose (vomiting within 1 hour + severe blast/burn injuries); do not withhold comfort care

The expectant category is psychologically the most difficult aspect of nuclear triage. It exists because directing limited medical resources toward non-survivable cases consumes resources needed to save those who can survive.

Improvised First Aid — Step by Step

Flash Burns

1. Remove the person from ongoing thermal exposure (move away from fires, burning structures).
2. Remove clothing from burned areas — cut around clothing stuck to burned skin; do not peel.
3. Cool the burn — run cool (not cold) water over the burn for 10–20 minutes. Do not use ice.
4. Cover the burn — use clean, non-fluffy material (cling film is ideal; otherwise a clean plastic bag or cloth). Do not apply butter, toothpaste, or oils.
5. For blisters — do not break them. Cover gently. Intact blisters protect against infection.
6. Monitor for shock — burns cause fluid loss. Keep the person warm (but not hot), lying down, and give small sips of water if conscious and able to swallow.
7. Prioritise the airway — facial burns or singed eyebrows suggest inhalation injury. The airway can swell and close. This is a priority emergency.

Blast Lung (Suspected)

1. Place the person at complete rest.
2. Position semi-upright (45 degrees) if conscious, or recovery position if unconscious.
3. Do not give supplemental oxygen unless available — it is not generally harmful but false reassurance from its absence is dangerous.
4. Watch breathing rate and effort every 15 minutes.
5. Any worsening — increased breathing rate, coughing blood, declining consciousness — means this person has deteriorated to Immediate priority.

Eardrum Rupture

1. Do not insert anything into the ear canal.
2. Cover the ear with a clean, loose dressing to keep debris out.
3. Expect significant temporary or permanent hearing loss — communicate by writing or clear, face-to-face speech.
4. The injury itself is rarely dangerous, but it is a marker that the person was close enough for other primary blast injuries.

Projectile / Fragment Wounds

1. Control bleeding with direct pressure — use the cleanest material available.
2. Do not remove embedded objects — stabilise in place with padding around the object.
3. For penetrating chest wounds: seal with an occlusive dressing (plastic taped on three sides) to prevent tension pneumothorax.
4. Prioritise blood loss control over all other wound care.

Radiation Exposure — Managing ARS Without Medical Care

1. Move to shelter — the priority is reducing further dose. Get to the best available shelter and stay.
2. Hydration — drink clean, uncontaminated water. ARS causes vomiting and diarrhoea leading to dehydration.
3. Rest — bone marrow suppression means any physical exertion is dangerous as the illness progresses.
4. Infection prevention — after the latent phase, the immune system fails. Any wound is a potentially fatal infection source. Keep wounds clean and covered.
5. Symptom management — if antiemetics (anti-nausea medication) are available, administer them to maintain hydration.
6. Document exposure time — this information is critical for medical staff when care becomes available.

Ear Protection During a Blast Event

If you receive any warning (even seconds) before a blast:

• Open your mouth wide (equalises pressure across the eardrum).
• Cover your ears with your palms.
• Turn away from the direction of the blast.
• Drop to the ground behind any solid cover.

This can reduce the probability of eardrum rupture and reduce secondary fragmentation injury from glass and debris.

Quick Reference

Injury Type	Primary Sign	Immediate Action
Blast lung	Breathing looks OK but deteriorates	Rest, semi-upright, monitor every 15 min
Eardrum rupture	Sudden hearing loss, ringing, ear pain	Loose clean cover, do not insert anything
Flash burns	Red/blistered/white skin on exposed areas	Cool water 10–20 min, cover, treat for shock
Fragmentation wounds	Penetrating injuries, bleeding	Direct pressure, stabilise embedded objects
ARS (early)	Vomiting within 1–6 hours of exposure	Shelter, hydrate, rest, infection prevention
ARS (moderate)	Vomiting 2–6 hours after exposure	As above; better prognosis than early onset
Blast organ rupture	Severe abdominal pain, blood in urine	Rest, no food/water, urgent medical evacuation

Nuclear blast injuries require prioritising survivable casualties and using available resources wisely. The combination of blast, thermal, and radiation injuries in a single patient is particularly demanding, but systematic assessment using the categories above can guide improvised care until professional help arrives.