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Probably around 50 to 60 as most of the fallout is fission fragments from fissions of the uranium-238 radiation casing surrounding the fusion stage due to 15MeV fission neutrons generated. About 90% of the bomb yield is from this fission also.

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If a fusion reaction produces no appreciable radioactive isotopes then why does a hydrogen bomb produce significant radioactive fallout?

A hydrogen bomb is actually a fission-fusion-fission reaction. The primary fission trigger (plutonium) supplies the energy to induce fusion, but then the fusion energy is used to initiate the secondary fission, which is a large amount of uranium. (in a "clean" H bomb, the uranium is replaced with lead, making it much weaker) also, the radiation will affect the surrounding area, creating a large number of isotopes, dramatically increasing the radioactive fallout.-Akilae


Is hydrogen bomb dirty?

We'll consider "dirty" to mean producing radioactive fallout. Since hydrogen bombs (fusion bomb) require the energy from an atomic bomb (fission bomb) they are a little dirty. Its mostly the atomic bomb that creates dangerous isotopes that contaminate the blast area, and regions down-wind. Now an H-bomb is generally "cleaner" than a bomb purposefully-design to create a large amount of dangerous, radioactive fallout. There are various techniques where one can change the type and duration of fallout. These types of weapons are generally use fission (not fusion) to create this effect.


What does the H-bomb do?

explode and produce radioactive fallout


What element was discovered in the debris from the first hydrogen bomb explosion?

The fallout of Ivy Mike contained two new elements which were then named einsteinium and fermium.


What was one after effect after the atomic bomb was dropped?

Radiation and atomic fallout (radioactive dust/debris forming a cloud).


What is the fallout for nuclear bomb?

Fallout is a mixture of:fission productsdirt picked up by the updraft into the mushroom cloudneutron activated isotopes of normally non-radioactive parts of the bomb and nearby objectsoxides of unfissioned uranium and/or plutonium from the bombetc.


What elements are in atom bombs?

if the bomb is a fission bomb it will use uranium 235 for fuel. if the bomb is a thermonuclear bomb (fusion) it will use the element hydrogen and an isotope of hydrogen for fuel.


What 2 radioactive elements were chosen for the atomic bomb?

Uranium-235 and plutonium-239 were the two radioactive elements chosen for the atomic bomb dropped on Hiroshima and Nagasaki.


How long is the fallout of one atomic bomb?

The fallout of an atomic bomb can last for days to weeks, depending on weather conditions and the size of the explosion. Fallout consists of radioactive particles that are carried by wind and can spread over large areas, causing long-term health and environmental effects. Evacuation and sheltering measures can help reduce exposure to fallout.


Was einsteinium used in the hydrogen bomb?

No, but it was produced in several of the tests and was first discovered in the fallout.


Does a atomic bomb destroy a tornado?

Absolutely. However, the certain widespread dispersal of radioactive fallout would deem this solution a ridiculous one.


Does an atomic bomb release radioactivity?

Yes, an atomic bomb releases a large amount of nuclear radiation in the form of gamma rays, neutrons, and radioactive fallout. This radiation can cause severe health effects in humans and the environment.