I would like to say you that for applying for the Msc in nuclear medicine there few colleges that offers this course like IIT KHARAGPUR , manipal university ,Rajiv gandhi paramedical institute ,Delhi AIIMS

And for applying in this college you have to go with the entrance exam which they offer .

So getting the information about delhi aiims regarding Msc nuclear medicine you can go to the given link

https://www.careers360.com/university/all-india-institute-of-medical-sciences-new-delhi/msc-nuclear-medicine-technology-course

I hope my answer helps. All the very best for your future endeavors!