Dear Aspirant,

Ofcourse you can, given that you have passed your class 12th exam from a recognised board and you have a science background. You can definitely go for this diploma course. You should sort out some of the colleges according to your preferences of accommodation, fees, reputation etc. I can help you with that by providing you a link which contains the list of colleges offering this course.
https://medicine.careers360.com/colleges/list-of-diploma-in-radiology-colleges-in-india

Hope this Helps!
Best Wishes