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under ground test did not cause as much nuclear fallout or something like that
When a nuclear weapon explodes above ground there is a great upsurge in air currents because of the heat released-you will have seen pictures of the 'mushroom' cloud no doubt. This carries the fission products formed by the nuclear explosive, and also a lot of dust and debris some of which will have been made active by the huge burst of neutrons released in the explosion. This cloud is carried up so far and then falls to earth-this is the nuclear fall out. The prevailing wind will determine which way the plume goes, and how far.
When the ground water flow out of the earth surface as a form of spring.
The answer is false. Ground water is water retained below earth's surface. BELOW THE SURFACE.
The Earth's surface, where it is not water, is called the ground.
Only trace levels, with the natural trace levels completely swamped out by the manmade trace levels from nuclear fallout (both from above ground weapons tests and the Chernobyl and Fukushima reactor disasters) by a factor of many millions.
Yes
Since fallout is created when a nuclear explosion lifts dirt and debris particles into the air and irradiates them, there is no way to 'stop' nuclear fallout from occurring except by never exploding a nuclear weapon on or near the ground. You CAN stop nuclear fallout from reaching you, though, if you have a good strong shelter that is lined with enough dirt or sand (or thick walls and ceilings using many feet of metal and/or concrete), etc.
every above ground, surface, or shallow subsurface nuclear test produced fallout. Look up the number of such tests performed and you have your answer.The book Under the Cloud there is a fallout path map for every Nevada Test Site shot that generated fallout. We did not miss any of the continental 48 states and even left some in Canada & Mexico.
Every country in the world received some fallout while nuclear weapons were being tested above ground.
under ground test did not cause as much nuclear fallout or something like that
Its the nuclear dust and debris that settles in the air after a nuclear explosion. This then comes down on the ground. Its a mixture of nuclear particles, and debris from the surrounding area. This can cause radiation sickness.
Surface bursts create craters, lots of fallout, and damage/destroy fortified underground structures; but the total area of surface damage is less than that of air bursts of similar yield because the blast wave is partially contained.
Either:As close as possible to any ground zeroAs far as possible from all ground zeros inside a properly designed and stocked fallout shelter
They learned about how far fallout can travel and affect people outside blast zones.
sub surface burst
sub-surface burst