The variation with neutron energy of the sensitivity of a polyethylene moderated boron counter has been investigated experimentally at 2. 3 MeV, 550 keV, 210 keV, 1 1 0 keV, 340 eV and 5 eV, and theoretically by the multigroup diffusion method in the same range different moderator thicknesses up to 10 cm were considered.nResults show good agreement between experimental and theoretical sensitivities for the keV and MeV energies, while a discrepancy of the order of a factor 2 at the most is obtained in the eV region.
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