From
http://en.wikipedia.org/wiki/Boron#11.C2.A0B_depleted_boron
11B is also a candidate as a fuel for aneutronic fusion. When struck by a proton of about 500 Kev, it produces three alpha particles and 8.7 Mev of energy. Most other fusion reactions involving hydrogen and helium produce penetrating neutron radiation. This induces long term radioactivity in reactor structures and weakens them, as well as endangering operating personnel. The alpha particles from 11B fusion can be turned directly into electric power and all radiation stops as soon as the reactor is turned off.
Also interesting:
http://discovermagazine.com/1998/may/physicswatchfusi1449
And:
http://www.ichaphysics.com/chapter-1-introduction/
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