Neutron activation of elements gives rise to an energy release during the subsequent radioactive decay. This paper deals with the development of a large, almost 4π, spectrometer for accurate and efficient measurements of photon and electrondecay heat of neutron activated elements. The spectrometer consists of a well-type 22.8 x 22.8 cm cylindrical CsI(Tl) scintillator (for photon detection) and a small plastic electron detector inserted in the well. The spectrometer was designed to have manyexcellent features such as the possibility to measure simultaneously the total activity of the sample and its electron and photon decay heat separately with high sensitivity and wide dynamic range. To demonstrate the feasibility of decay heat measurements with our spectrometer, we have irradiated twelve samples of different materials using the 14 MeV neutron generator FNG. The measurements have been compared with the prediction of the activation system EASY-99 and the results in term of the C/E (calculationvs. Experiment) are presented. While most of the C/E values are, within the uncertainties, equal to one, discrepancies for one radionuclide was found and are discussed in the paper. © 2014 Atomic Energy Society of Japan.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics
- Nuclear Energy and Engineering