Little Boy was the nuclear bomb detonated over Hiroshima. It used uranium and had an explosive blast equivalent to 12,500 tons of TNT. A 1 megaton hydrogen bomb, hypothetically detonated on the earth's surface, has about 80 times the blast power of that 1945 explosion.
Considering the tonnage of a bomb to be contant, The blast radius varies dependent on whether it is a ground burst or an airburst. Further, the height of the airburst above ground affects the radius too. At a height of 1900 feet above ground, Little Boy produced a blast radius of 1 mile; an area of some 4.7 square miles.
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Increasing positive nuclear charge
See the book The Effects of Nuclear Weapons for equations. My copy came with a circular slide rule that calculates that for optimal altitude airburst and surface burst over a yield range of 1 KTon to 10 MTon. It also calculates many other effects.
It depends on how big your head is.
The answer will depend on whether the larger cylinder is 4 times larger in terms of radius, cross-sectional area, or volume. If radius, multiply the smaller radius by 4. If cross-sectional area, multiply the smaller radius by 2. If volume, you do not have enough information.
It depends on what you mean by "big". It has a radius of 600 inches.