have been investigated. With the continued γ-irradiation, a rod type FeOOH nanoparticle
disappeared and the product was a spherical γ-Fe2O3 nanoparticle, which had an average
size of 30 nm. XRD, SAD and TEM were used to characterize the structural characterization
and to determine their morphology, respectively. The VSM spectrum was obtained to study
magnetic properties of the products.