International fluence rate intercomparison for 2.5, 5.0 and 14 MeV neutrons

Fluence determinations for 2.5, 5.0 and 14 MeV neutrons as performed in standard laboratories have been compared. Two methods of intercomparison were used: One is based on the determination of a γ-rate ratio between 115Insup(m) as induced by fast neutrons in an indium sample on one hand and 15Cr from a calibrated source on the other hand and is used at all energies. The second method is restricted to 14 - 15 MeV neutrons and is based on measuring the 92Nbsup(m) γ-activity induced in a niobium sample. Results show that the uncertainty contribution from the transfer methods does not essentially increase the overall uncertainty and that there is generally consistency