Did you bother to LOOK at the university web page I supplied you with? Please do so. Curriculum vitae for Hanno Essén. He got his PhD in theoretical physics back in 1979. He's published multiple papers in the European Journal of Physics
It’s interesting to read of the analysis done of the used nickel powder:
“Ny Teknik: What analyses have you done on the powders?
Kullander: Element analysis and isotopic analysis. At the Ångström Laboratory in Uppsala, Sweden, element analysis has been made using X-ray Fluorescence (XRFS). Dr. Erik Lindahl undertook the investigation. At the Biomedical Center in Uppsala, both element analysis and isotope analysis has been done through Inductively Coupled Plasma Mass Spectrometry (ICP-MS). Associate Professor Jean Pettersson has made the measurement.
Ny Teknik: What results have you obtained from the analyses?
Kullander: Both measurements show that the pure nickel powder contains mainly nickel, and the used powder is different in that several elements are present, mainly 10 percent copper and 11 percent iron. The isotopic analysis through ICP-MS doesnt show any deviation from the natural isotopic composition of nickel and copper.
I have to go off what the university says, sorry.