Also there is a huge difference between a nuclear chain reaction and a bomb so I have no idea why you are even trying to drag that into our conversation.
Wow.
Simply.
Wow.
http://en.wikipedia.org/wiki/Nuclear_chain_reactionThat you would even attempt to claim that a nuclear chain reaction has nothing to do with a nuclear weapon is simply mind boggling.
I don't know where you are from, what your education is or why you persist in exposing your ignorance but please, stop embarrassing yourself. At this point, I really have to consider that I should disengage from this because it is fundamentally unfair to engage in a battle of wits with the witless.
REALLY? no connection between a nuclear chain reaction and a nuclear bomb?
REALLY?

Yeah really. Take that boot out of your ass and tell me what is so scary about a helium nuclei resulting from radioactive decay hitting another atom and triggering another decay. I do not know about you but we did that in basic physics class and I dont remember any mushroom clouds.
It is not the nuclear chain reaction that is the scary part. Its the mass to energy conversion better known as E = MC^2
When will you get this through that thick skull of yours. Perhaps I should make a wikipedia page for you?
Did they convince you that Einstein built nuclear weapons? 'Cause so far, everything posted here states that his involvement was about as much as the inventor of the wheel had to do with the automobile.
BTW, the concept you are reaching for is Mass Defect.
If you paid attention in that physics class you would have noted that a graph of mass defect versus isotope shows Helium to be remarkably unsuited as a nuclear fuel.