They are labeled " end-cap and neutron focus lens ," " reflector / neutron gun carriage ," and " reflector wrap.

They are labeled " End-cap and Neutron Focus Lens " and " Reflector Wrap "; the former channels neutrons to the U-235 / Pu-239 Spark Plug while the latter refers to an X-ray reflector ; typically a cylinder made out of an X-ray opaque material such as uranium with the primary and secondary at either end.

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