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That depends on the initial amount and type. It also depends on altitude (or depth) of burst. If you know the isotopes involved you can look up their half lives, measure current radiation intensity, and calculate time until radiation will drop to desired level.

You can also periodically measure radiation intensity over a period of time, then extrapolate to get a reasonable estimate of time to drop to desired level without knowing isotopes.

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Q: How long does the lethal radiation from a nuclear bomb take to die?
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Do South Africa possess atomic bomb?

No, South Africa long ago gave up its nuclear weapons program.


Why is an atomic bomb called a nuke?

Well I am pretty sure they call an atomic bomb nukes because atomic bombs and be called nuclear bombs. So instead of calling these super long name they made the bomb a short nick name a nuke


What was the name of the Soviet nuclear power plant that exploded and is considered to be the greatest nuclear disaster ever?

Chernobyl. And while it IS regarded as the worst nuclear disaster, in terms of long-term consequences, we are actually begining to discover that many of the supposedly radiation-caused illnesses are actually the result of an extremely high level of impurities, especially Lead in the water supply, and not actually the result of radiation poisoning as originally suspected. But, the jury is not in just yet.


How long will the effects on hiroshima last?

The radiation became null after so many years. The coral reef destroyed in Bimini Island by the nuclear experiments began to grow after 50 years.


What does an atom bomb do?

Without going into rigorous scientific detail, an atomic bomb works by nuclear fission. That is, large atoms - namely uranium or plutonium - are split into smaller atoms in an uncontrolled chain reaction. One atom splits, neutrons from that split strike and split more atoms, which release more neutrons, and so forth, in what is called a chain reaction. This releases a tremendous amount of energy all at once. Thus a single bomb, weighing no more than a few hundred pounds, explodes with the force of tens of thousands of tons of TNT.When we look at a hydrogen bomb, which is also a type of nuclear weapon (though strictly not an atomic bomb), we see that it works by nuclear fusion. That is small atoms - namely isotopes of hydrogen - are fused together to make atoms of helium. This releases even more energy. Thus a hydrogen bomb has a force of hundreds of thousands, or even millions of tons of TNT. Fusion requires fantastic temperatures and pressures to occur. The only way to create those conditions is to set off one or more atomic fission bombs. Essentially, a hydrogen bomb is a nuclear fusion device that requires an fission bomb as a detonator.Both types of bombs produce several effects: a blast wave, thermal (heat) energy, prompt (i.e. immediate) radiation, and fallout (long-term radiation), as well as intense electromagnetic disruption. The exact amount of each depends on the design of the weapon, its size, and where it was detonated.For the more detailed technical answer, use the link you'll find below for the related question.

Related questions

What are negative effects of Nuclear bomb?

Long Term effects due to radiation Massive Damage to buildings Radioactive area where the bomb exploded


Why used nuclear bombs at war time?

They're very destructive and last for a long time, In other words, once you've blown up a nuclear bomb somewhere, it will still be dangerous after the initial explosion has taken place. When a nuclear bomb is used there would be nuclear radiation that would still be present where the bomb hit for quite a while


What radiation is given off by a nuclear bomb?

prompt (at time of explosion) - neutron, gamma, x-ray, UV, visible, thermal (IR), some radio.delayed (fallout) - beta, gamma, some alpha.Types of radiation called "ionizing radiation" - alpha, beta, gamma, x-ray, neutron.


What is the difference between a bomb and an nuclear bomb?

Basically, a conventional bomb uses a chemical explosive as the source of its destructive power. A nuclear weapon uses nuclear material to create an explosion. A nuclear explosion is much larger, and also emits ionizing radiation. A chemical weapon does not emit any radiation. A nuclear weapon's yield is measured in Kilotons (thousand tons). In very simplified terms, this means that a nuclear weapon with a 475 kiloton yield produces an explosion comparable to 475,000 tons of TNT (TNT is a chemical explosive). That's A LOT of TNT and it would take up a bit of space. A nuclear weapon with this yield may only be a few feet long and a foot wide, and the actual nuclear material may be the size of a grapefruit.


How you could survive a nuclear bomb?

Be a long, long way away. Preferably on another planet. If you are in the direct blast radius, you don't, you die. You are almost instantly incinerated and reduced to dust. If you are only in the radiation zone, then a special suit could be used, but the radiation wouldn't kill you instantly anyways (most likely).


How long does it take to make uranium for a nuclear bomb?

Depending on the size and type of the bomb and also on the enrichment installation available.


How long does it take for the radiation to disappear from an area that has been effected by an atomic bomb?

decades


How long after Germany surrendered was the nuclear bomb finished?

2 months 8 days


What is more powerful a tornado or nuclear bomb?

An atomic bomb has more destructive potential, but a large, long-lived tornado would probably release more energy than a small nuclear weapon.


What does the half-life of the radioactive material have to do with the incident at chernobyl?

How long before people can safely return to the area. Much like a nuclear bomb, it has a period where the area should not be populated, by plants or animals due to the amount of radiation, which can cause death


When did they realize the nuclear bomb was dangerous?

Long before the first one was made. That was the purpose of making them: to have a very dangerous bomb (all bombs are dangerous).


Radiation is one of the long-term effects of a nuclear detonation what type of radiation is emitted only during the detonation?

AlphaBetaGammaX-RayNeutronUVBUVAVisible lightIRMicrowavesMore or less some of everything.