- Based on a BF3 detector at the centre of as moderating medium, but
directional.
- The detector is designed to be long enough that, at whatever neutron
energy, by the time it has penetrated into the inner paraffin
moderator, then the detector will appear the same to the neutron and
will be detected with the same efficiency.
- It is designed as a flat response detector for neutron physics work.
- The outer shield of paraffin and inner shield of boron have the
effect of only allowing neutrons from the right hand side of the
figure to enter the inner sanctum.
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