Nuclear reactions can be categorized as either fission (when an atomic nucleus splits into two lighter nuclei) or fusion (when two atomic nuclei combine to form a heavier nucleus). You can explore both of these reactions with a simple setup.
Small amounts of radioactive materials can be found in everyday objects, making nuclear fission a practical demonstration. For example, smoke detectors contain about 0.2 milligrams of americium-241, camping gas lanterns are coated with approximately 250 mg of thorium-232, and glow-in-the-dark gun sights contain around 1.2 micrograms of thorium-232. These materials are all radioactive and could potentially be combined to create a breeder reactor that uses neutrons emitted from one source to convert thorium-232 into the more radioactive uranium-233.
David Hahn, a boy scout from Michigan, attempted this in 1994, but did not progress beyond the neutron generator stage before drawing attention from authorities. It is unlikely that his setup ever reached a stage where it could generate useful power.
Creating a functioning nuclear reactor from nuclear fission requires the ability to slow and control neutrons to maintain a self-sustaining fission reaction. Achieving this balance is challenging, especially in small reactors, and proper shielding and cooling are essential for safety.
While modern “microreactors” are available in the 5 megawatt range, they are still the size of a shipping container, making them unsuitable for small-scale setups.
Building a fusion reactor that uses an electric field to accelerate deuterium ions and fuse them into helium 3 is possible at home, resulting in a cold purple plasma. However, the energy required for the electric field exceeds the useful energy obtained from nuclear fusion, making it impractical as a reactor.
This article, by Tim Hurst from Sheffield, provides an answer to the question “Can I build a nuclear reactor in my shed?”
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