Fractionation of copper activation products in debris samples from the National Ignition Facility

• Published in: Applied radiation and isotopes Vol. 143; pp. 163 - 175
• Main Authors: Moody, K.J., Gharibyan, N., Shaughnessy, D.A., Grant, P.M., Yeamans, C.B., Despotopulos, J.D., Cerjan, C.J.
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 01.01.2019; Elsevier
• Subjects: Fractionated debris; High energy neutrons; MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; National Ignition Facility; Neutron reaction cross sections; Radiochemical diagnostics; National Ignition Facility; Neutron reaction cross sections; Radiochemical diagnostics; High energy neutrons; Fractionated debris
• ISSN: 0969-8043; 1872-9800
• DOI: 10.1016/j.apradiso.2018.10.014

Nuclear fusion experiments performed at the National Ignition Facility produce radioactive debris, arising in reactions of fast neutrons with the target assembly. We have found that postshot debris collections are fractionated, such that isotope ratios in an individual debris sample may not be representative of the radionuclide inventory produced by the experiment. We discuss the potential sources of this fractionation and apply isotope-correlation techniques to calculate unfractionated isotope ratios that are used in measurements of nuclear reaction cross sections. •Debris from fusion experiments at the National Ignition Facility is inhomogeneous.•Fractionation techniques allow calculation of the average radionuclide inventory.•Corrected radionuclide concentrations support the calculation of nuclear cross sections.