(Originally printed here, reposted with permission.)
No one wants to think about a nuclear crisis – and hopefully it will never happen – but we all must accept the fact nuclear tensions are rising globally with Russia and China (and others are seeking nukes) so we should prepare ourselves and our loved ones in the event the unthinkable strikes our soil.
For decades, movies and some in the media have portrayed a nuclear attack as a “doomsday” event implying most people would be killed on impact … and survivors would want to die once they come out of their shelters.
In reality, unless you are actually at ground zero or within a several mile radius of the blast zone (depending on the size of the nuke, of course), there is a very high probability you’ll survive as long as you…
- limit your exposure to radiation and fallout,
- take shelter with proper shielding, and
- wait for the most dangerous radioactive materials to decay.
In other words, you CAN survive a nuke attack … but you MUST make an effort to learn what to do! By learning about potential threats, we are all better prepared to know how to react if something happens.
Please realize this is being written with small nuke devices in mind (like a 1-kiloton to 1-megaton device). A larger device, ICBM or a nuclear war would cause more wide-spread damage but some of this data could still be helpful. These are some very basic tips on sheltering for any type of nuclear (or radiological) incident.
What happens when a nuke explodes?
A nuclear blast produces a blinding light, intense heat (called thermal radiation), initial nuclear radiation, 2 explosive shock waves (blasts), mass fires, and radioactive fallout (residual nuclear radiation).
The below graphic shows the destruction of a test home by an atomic blast on March 17, 1953 at the Nevada Proving Ground. The structure was located 3,500 feet from ground zero, and the time from the first to last picture was 2.3 seconds. It shows the force of the blast wave then the radiating energy set it on fire.
Also, if a nuke is launched over our continent and explodes miles above the earth, it could create an electromagnetic pulse (EMP). An EMP is a split-second silent energy burst (like a stroke of lightning) that can fry electronics connected to wires or antennas like cell phones, cars, computers, TVs, etc. Unless electronics are grounded or hardened, an area or nation could experience anything from minor interference to crippled power, transportation, banking and communications systems.
An EMP from a high-altitude nuke (where a nation or group succeeds in detonating a nuclear device carried miles into the atmosphere) could affect electronics within 1,000 miles or more as shown below. (Evidence suggests some countries and groups are working on enhanced and non-nuclear EMP weapons or e-bombs.)
What is the most dangerous part of a nuclear attack?
Both the initial nuclear radiation and residual nuclear radiation (also called radioactive fallout) are extremely dangerous.
Initial nuclear radiation is penetrating invisible rays that can be lethal in high levels.
Radioactive fallout (residual nuclear radiation) is created when the fireball vaporizes everything inside it (including dirt and water). Vaporized materials mix with radioactive materials in the updraft of air forming a mushroom cloud.
Fallout can be carried by winds for hundreds of miles and begin falling to the ground within minutes of the blast or take hours, days, weeks or even months to fall. The heaviest fallout would hit ground zero and areas downwind of that, and 80% of fallout would occur within 24 hours. Most fallout looks like grey sand or gritty ash and the radiation given off cannotbe seen, smelled, tasted or felt which is why it is so dangerous. But as the materials decay or spread out radiation levels will drop.
More about radiation
Types of radiation – Nuclear radiation has 3 main types of radiation…
- alpha– can be shielded by a sheet of paper or by human skin. If alpha particles are inhaled, ingested, or enter body through a cut, they can cause damage to tissues and cells.
- beta– can be stopped by skin or a thicker shield (like wood). Beta particles can cause serious damage to internal organs if ingested or inhaled, and could cause eye damage or possible skin burns.
- gamma– most dangerous since gamma rays can penetrate the entire body and cause cell damage throughout your organs, blood and bones. Since radiation does not stimulate nerve cells you may not feel anything while your body absorbs it. Exposure to high levels of gamma rays can lead to radiation sickness or death, which is why it is critical to seek shelter from fallout in a facility with thick shielding!
Radiation detection devices – You cannot see, smell, taste or feel radiation, but special instruments can detect even the smallest levels of radiation. Since it may take days or weeks before First Responders could get to you, consider having these devices handy during a crisis or attack since they could save your life.
Measuring radiation – Radiation was measured in units called roentgens (pronounced “rent-gens” and abbreviated as “R”) … or “rads” or “rem”. An EPA document called “Planning Guidance for Response to A Nuclear Detonation 2nd Edition June 2010” explains … 1 R (exposure in air) ≅ 1 rad (absorbed dose) ≅ 1 rem (whole-body dose). Although many measuring devices and older documentation use R and rem, officials and the media now use sievert (Sv) which is the System International or SI unit of measurement of radiation. The formula to convert sieverts to rems is quite simple … 1 Sv = 100 R (rem).
How many rads are bad? – High doses of radiation in a short span of time can cause radiation sickness or even death, but if that high dose is spread out over a long period of time, it’s not as bad.
According to FEMA, an adult could tolerate and recover from an exposure to 150R (1.5 Sv) over a week or 300R (3 Sv) over a 4-month period. But 300R (3 Sv) over a week could cause sickness or possibly death. Exposure to 30R (0.3 Sv) to 70R (0.7 Sv) over a week may cause minor sickness, but a full recovery would be expected. But radioactive fallout decays rapidly so staying in a shelter with proper shielding is critical!
The “seven-ten” rule – For every sevenfold increase in time after the initial blast, there is a tenfold decrease in the radiation rate. For example, a 500 rad level can drop to 50R in just 7 hours and down to 5R after 2 days (49 hours). In other words, if you have shelter with good shielding and stay put for even just 7 hours … you’ve really increased your chances of survival. Your detection devices, emergency radio or cell phone [if the last 2 are working, that is] can assist you in knowing when it’s safe to come out.
