How does radiation kill cancer cells?

Do you ever wonder how this happens? How does the radiation treatment actually kill cancer cells? I asked my radiologist this question right away once I heard I needed 25 rounds of radiation. As I laid on the table with my arm over my head and the machine spinning around me, holding my heart in so the beams wouldn’t damage my heart, I wondered what is this machine doing?!! I didn’t feel anything and it only took five minutes so how was this machine killing cancer cells??
I had the privilege of spending an hour interviewing my medical advisor -Dr. Ramji Rajendren -Radiation Oncologist-to help answer this question and many more! New page on website called Radiation Education! I hope you find this interesting and helpful. I sure did! Grateful for modern technology and the advances being made with radiation treatments.