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Boron trifluoride detector
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  • This detector takes advantage of the 10B(n,a) reaction. Boron is present as a gaseous BF3 and the system is rub as a proportional counter.
  • Most of the (n,a) reactions do not leave the product 7Li in its ground state, but in its first excited state. This will subsequently de-excite down to the ground state, in most cases emitting a 0.482 MeV gamma.
  • Therefore expect to see two separate peaks in a pulse height spectrum.
  • Within the spectrum produced things to take into consideration are:

Wall effects
Gas pressure
Gamma sensitivity


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1999, 2000 The University of Liverpool, Department of Physics

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