There are many different types of radiology technician programs, so it really depends on which one you choose. However, most programs will include classroom instruction as well as clinical training, so that you can learn both the theory and the practical skills necessary for the job. The length of the program also varies, but most last between one and two years.
Here is a link to a radiology technician program directory, so that you can compare programs and find one that best suits your needs:
https://www.radiologyed.org/programs