title: Depth profiling 137Cs and 60Co non-intrusively for a suite of industrial shielding materials and at depths beyond 50 mm.
abstract: A phantom has been used to position two radiation sources, separately, when buried under dry-silica sand at depths between 5 and 50 mm. A γ-ray energy spectrum was then measured at every 1 mm depth. Principal component analysis has been conducted, which has led to a non-linear fit being established, allowing the depth of entrainment to be accurately inferred. The technique has been expanded for additional shielding media: water, aggregate and both wet and dry soil. The technique has also been expanded beyond the previous depth constraint of 50 mm.
authors.affiliation: Engineering Department, Lancaster University, Lancaster, LA1 4YR, UK. jcadams@univ.bangor.ac.uk
authors.forename: Jamie C
authors.initials: JC
authors.lastname: Adams
authors.forename: Malcolm J
authors.initials: MJ
authors.lastname: Joyce
authors.forename: Matthew
authors.initials: M
authors.lastname: Mellor