The core of an infinite planar thermal reactor consists of a solution of 239Pu and H20...
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Neutron economy is improved when the core of a reactor is surrounded by a reflector, namely a thick, unfueled region of moderator. The neutrons that otherwise would leak from the bare core now pass into the reflector, and some of these diffuse back into the core. The net result is that the critical size, and hence mass of the system is reduced. Consider a reactor composed of a slab of thickness a with reflectors of thickness b on...