Hello Rohith

Nuclear chemistry is very good line to  focus on . Some of the colleges that Have courses for nuclear chemistry are

1.IIT Bombay

2.IIT Madras

3.Jadhavpur University kolkata

4.Sathyabhama Institute

5.IIT Kanpur

These colleges are with respect to India

Some other colleges that you can find outside India are

1.University of Michigan

2.MIT

3.North Carolina state university

4.University of Wincosin

5.University of Texas

I hope this helps

Thanks and Regards