I am doing Diploma in X Ray technician. Am I eligible to pursue B.Sc in radiotherapy after doing Diploma?

Yes, you should be able to pursue B.Sc in radiotherapy after your Diploma provided you meet the minimum requirements to gain admission in B.Sc. B.Sc Radiotherapy eligibility: 1) 10+2 (Medical) or equivalent with 55% marks. 2) Few institutes conduct entrance exam for admission.