Neutron yield measurements by use of activation techniques on TEXTOR-94

The time integrated neutron yield on TEXTOR is measured with an activation system which pneumatically sends the samples near to and from the plasma edge. After irradiation the samples are counted by an absolutely calibrated high purity germanium (HPGe) detector. The uncertainty in the calibration of the HPGe detector is less than 2%. By using threshold reactions for indium and silicon samples it is possible to distinguish between the 2.5 and 14 MeV neutron emission. MCNP code simulations have been performed in order to determine the neutron fluence and energy distribution at the irradiation position. This allows calculation of an activation coefficient which relates the activation of the sample to the total yield from the TEXTOR plasma. For the 2.5 MeV neutron emission the corresponding error is less than 15%. Details on the measuring procedure as well as on the calibration method of the HPGe detector are provided. Results of calibration monitoring of the neutron source strength measurements and the trito...