The work will aim to use the unique property of muons, as sensitive probes of their local magnetic environment, to investigate the source of the electronic magnetism observed in Pd bionanoparticles. Currently, there is no agreement as to whether such magnetism resides in all constituent atoms equally or only in those on the surface. Ab initio calculations using two models (surface only or bulk contribution) predict equal magnetisation in the 5-7 nm particles which constitute the ferromagnetic/superparamagnetic component of the biopalladium material. We propose to study particles at three stages of a new treatment which removes biomaterial from the nanoparticles. We expect the treatment to have a greater effect on magnetisation if a surface mechanism were responsible since it impacts at the particle surface and not on its size or shape.