I've tried and I can't find out
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You need to do the quest "Power of the Atom"
Go to Moriartys Saloon at the far end of Megaton, up at the top, and go inside and speak to a guy in the corner called Mr. Burke, then he will ask you to blow up Megaton, and give you the explosive required.
There is a guy in the bar you can talk to, but first you have to talk to Lucas Simms to start the quest. Ask him about the bomb, and he will let you do whatever with it. Then you go to the bar and talk to Mr. Burke. He is sitting in the corner to your right as soon as you enter. He will give you something to attach to the bomb. Before you blow up Megaton, do everything you need to do there first. There is an extremely long quest, the main storyline is there, and one more side quest is there also. Do those before you go crazy and blow up Megaton.
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