hi,

see the eligibility criteria for m.sc in nuclear medicine is candidates must have  completed B.Sc. in the same field or relevant field from a recognized and registered university. however according to tata memorial center admission policy, candidate who has completed  B.Sc in Physics, Chemistry, Mathematics, Zoology, Microbiology, Biochemistry, Bioinformatics, Biotechnology, Nuclear Medicine with Physics or Chemistry as one of the subjects in graduation from a  University which is recognized by the University Grant Commission.

however AIIMS delhi  offer m.sc in nuclear medicine technology. eligibility criteria is b.sc in p biology related discipline or life science or in allied health sciences like radiology/ radiotherapy etc. so you are eligible to apply. follow the below link to know in details:

https://www.aiimsexams.org/pdf/Prospectus%20MSc-2020.pdf