Prepare / Nuclear fallout
How do you prepare for a nuclear emergency?
This is the scenario nobody wants to think about, which is exactly why thinking about it once, calmly, matters.
The first 24 to 72 hours sheltered are decisive, and the choices are simple: get inside, stay inside, stay tuned.
This guide covers the first hour, the supplies that let you stay in, and the small set of skills that count.
The shelter-in-place and potassium iodide guidance on this page is aligned with ready.gov and CDC recommendations. ready.gov: nuclear explosion · CDC: radiation emergencies
The first hour
- If you see a sudden, intense flash, do not look at it. Drop behind something solid and stay down until the blast wave passes.
- Get inside the nearest solid building immediately, before fallout begins to settle. That often starts within 10 to 15 minutes.
- Go to a basement or the center of a large concrete or brick building, away from the roof and outer walls.
- Seal your space: close and tape windows, doors, and vents, and shut off outside air intake during the heaviest fallout.
- Do not get in a car to flee through fallout. A good shelter beats an exposed journey.
- Turn on a battery or hand-crank radio and follow official guidance on when it is safe to move.
What to stock
| Item | Per person, per day | Notes |
|---|---|---|
| Water (drinking and hygiene) | 1 gallon (about 4 liters) | The ready.gov standard including hygiene. Survive//Protocol plans a 3 liter (about 0.8 gal) drinking minimum and raises it in hot climates. Rotate stored water every 6 to 12 months. |
| White rice | 7 oz (200 g) | Keeps 25+ years sealed, dry, and cool. |
| Dried beans and lentils | 3.5 oz (100 g) | Keeps 10+ years sealed. |
| Rolled oats | 2.8 oz (80 g) | Keeps 2 years, longer sealed. |
| Pasta | 3.5 oz (100 g) | Keeps 2 to 3 years. |
| Canned protein (fish or meat) | 5.3 oz (150 g) | Keeps 2 to 5 years. |
| Canned vegetables | 4.2 oz (120 g) | Keeps 2 to 5 years. |
| Cooking oil | 1 fl oz (30 ml) | Keeps 1 to 2 years. |
| Salt | 0.35 oz (10 g) | Keeps indefinitely. |
| Sugar or honey | 0.7 oz (20 g) | Honey keeps indefinitely. |
| Powdered milk | 1 oz (30 g) | Keeps 2 to 10 years sealed. |
| Multivitamins | 1 tablet | Keeps about 2 years. |
| N95 respirators | A small supply per person | Filter airborne particles when you must move through dust. |
| Battery or hand-crank radio | 1 per household | Official broadcasts work when networks do not. |
| Sanitation bags | A roll per household | So nobody has to step outside during the heaviest fallout. |
| Potassium iodide (KI) | Per official dosing | Take it only when authorities advise, at the correct dose for each person's age. |
Amounts are per person, per day. Multiply by your household size and the number of days you want to cover. Survive//Protocol does this math for you, from 1 week to 1 year.
Skills to learn now
- The core response: get inside, stay inside, stay tuned. At a sudden bright flash, drop and cover away from windows.
- Sealing a room: closing and taping windows, doors, and vents, and cutting outside air during the heaviest fallout.
- Decontamination: remove and bag outer clothing, then wash skin and hair with shampoo but no conditioner, which can bind particles to hair.
- Time, distance, shielding: less time exposed, more distance from fallout, and more mass between you and it. Earth, concrete, water, and even books all count.
- Food and water safety after fallout: sealed and canned stores are safe, cover stored water, and never eat exposed fresh food or drink from open water.
If you have kids, elderly, or pets
- Children and elderly family members: add comfort items, extra warmth, and familiar routines, and increase your water and medication buffers.
- Pets: store a week or more of food per animal, any pet medication, and pack a leash or carrier with your emergency kit.
- Infants: over-stock formula, bottles, diapers, and wipes. These vanish from shelves first.
- Potassium iodide doses are age-specific. Know the right dose for each child before you ever need it, and only give it when authorities advise.
Common mistakes
- Trying to outrun fallout by car instead of sheltering first.
- Taking potassium iodide on your own schedule. It protects one gland against one isotope, only when authorities say the release calls for it.
- Using hair conditioner during decontamination. It can bind fallout particles to hair.
- Leaving shelter too early. Fallout radiation drops fast in the first days; 24 hours is the minimum, 48 to 72 is better.
- Ignoring the wind. Fallout drifts downwind, so safer ground is upwind or far to the side of the blast.
FAQ
How long do I need to stay inside after a detonation?
At least 24 hours, ideally 48 to 72. Fallout radiation weakens quickly in the first days. Step out only for true necessities, then get back in, and follow official guidance for when to leave.
Does distance from a city really matter?
Yes. The farther you are from likely targets such as large cities, capitals, and military sites, the lower your blast and fallout risk. If you must relocate with warning, move well outside the city and upwind.
When should I take potassium iodide?
Only when authorities advise it, at the correct dose for each person's age. It is not a general radiation cure.
Is my stored food safe after fallout?
Sealed and canned food is safe. Cover stored water, and never eat exposed fresh food or drink from open water after fallout.
Related guides: War · Power outage · Pandemic