For neutron cross section measurements it is necessary to know the applied neutron intensity. The TU Dresden runs a DT neutron generator which provides a strong quasi-monoenergetic neutron field. The neutron fluence can be measured via the activation method. An exemplary irradiation procedure and neutron flux analysis will be presented. An argon gas sample contained in a steel sphere was irradiated in a 14 MeV neutron field produced by TU Dresden’s neutron generator. The sample was positioned in close geometry in order to gain a high neutron flux. Six metal foils, two of them consisting of Al, Zr and Nb respectively, served as neutron monitors. After the irradiation, the monitors’ activities were measured using a high purity germanium detector surrounded by a lead shielding. An efficiency calibration of the detector was done using point sources of known activity and supported by Monte-Carlo (MC) simulations.