Hello student.
Both BSc Radiology and B.Sc Botany are three year undergraduate courses.
B.Sc Radiology deals with study of different imaging techniques as a part of investigations of diseases ranging from simple fracture to cancers and other pathologies. After pursuing a career in this field you can work as a Radiology Technician , Radiology Nurse, Radiology Assistant, Ultrasound Technician, MRI Technician, CAT Scan Specialists , CT Scan Technologists

B.Sc Botany deals with study of plants, their anatomy and physiology. The subjects in B.Sc botany are Phycology,Bacteriology,Mycology,
Plant Cell Biology, Palaeobotany,etc .If you are interested in the subject you can pursue it. One can work as a geneticist, researcher, botanist, ecologist, etc.

Both the fields have a wide scope. What you choose as your career pathway depends upon your field of interest.