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BGRR Operations: Fast Chopper

This scene at the north face of the BGRR shows the fast neutron chopper. Inside the dome-shaped housing is a cylinder which whirls at speeds of several thousand RPMs. Along the outer surface of the cylinder are slits through which neutrons from the reactor pass. When a hole passing the opening in the reactor face is lined up with a hole directly opposite, neutrons emerge through the two narrow slits visible in the end of the cylinder in front. Neutrons are “sorted out” in bursts – a convenient method of studying their energies. The goose neck pipe at left connects vacuum pumps to the chopper.