Max Littlemore writes "I have been breeding at home using lots of old smoke detectors with a view toward generating my own and getting off the grid. The only thing stopping me is a reliable neutron beam. Given that all the equipment I'm using is re-purposed kitchen equipment, concerns about safety mean I'm to build a uranium reactor to supply neutrons to the thorium one. So I'm putting the question out there: do any Slashdotters know of a way to make a powerful neutron beam out of things I might find around the house?" It would be helpful to include images and diagrams of your own personal neutron beam .