Speaker
Description
The Mineral Positron Emission Tomography (MinPET) technology enables a three-dimensional imaging of diamonds within a kimberlite host rock by reconstructing coincidence 511 keV gamma rays from $^{11}$C. These are produced via the $^{12}$C($\gamma$, n)$^{11}$C bremsstrahlung reaction during irradiation. However, the activation process also induces radioactivity in the surrounding kimberlite matrix, generating a mixed field of background isotopes that must be understood for radiological safety and signal discrimination. To investigate this, a Full-Dress Rehearsal (FDR) experiment was conducted at the ASTRID2 accelerator facility at {\AA}rhusrhus University, Denmark, using a 100 MeV electron beam to replicate the MinPET activation stage. High-purity germanium (HPGe) spectroscopy was employed to measure gamma emissions from irradiated samples. This study focuses on extracting the lifetimes of the resulting radioisotopes from the measured energy spectra. The experimentally determined lifetimes are compared with reference values from the Table of Radiation Isotopes. The results show good agreement between measured and tabulated lifetimes across all identified isotopes. These findings enable the construction of a comprehensive inventory of activation products and allow for clear differentiation from Naturally Occurring Radioactive Materials (NORM). The validated lifetime data contribute to a long-term radiological safety assessment, confirming that the isotopic signatures produced during MinPET operation are well characterized and consistent with established nuclear data.
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