Or anything related with shielding materials and dosimetry for medical application. I need topics that can be researched on and suitable for undergraduate research work.
In my opinion, you could expand and search for "luminescence methods for radiation dosimetry applications". Or you may be interested in the topic "Armoring of rooms containing radionuclide in hospitals using shielding materials". Of course, you can enrich and restrict these titles by considering your major university and research opportunities.
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