Cheryl .....
I can perfectly understand your radiation concerns.
Many years ago, when I was 13 years old, I had massive doses of "radium" following a routine tonsillectomy/adenoidectomy (nasopharyngeal radium irradiation). From my doctors, as well as a presentation by a Yale University professor at the recent ANA Symposium, it is almost certain that my acoustic neuroma was caused by these treatments as a child. At this point in time, the only confirmed cause of some ANs is ionizing radiation.
That being said, the current dose (Gy) of radiation being given via Gamma Knife, Cyberknife, or fractionated radiation is far, far less than what was used even 10 years ago or before ..... and is targeted specifically on the tumor. Techniques have improved so much that very little normal brain tissue is damaged. As was explained to us at the symposium, normal tissue can repair itself while tumor tissue cannot.
If I had not had the huge exposure to radiation, I think I would have considered much more seriously going the radiation treatment route. Since I am now in a "high risk" category, I have the full cooperation with my dentist to hold on all but the most essential dental x-rays. Given a choice between CT or MRI, I always request the MRI, which has no radiation. Sometimes we, as patients, inadvertently cause a doctor to order tests when we want answers to health concerns.
I think it is important for all of us to minimize unneeded radiation and therefore I recently purchased a radiation free blue tube adapter to use with my cell phone.
One other thought ..... if I understood the presenters correctly, exposure to radiation does not keep on accumulating over one's lifetime exactly ...... because the radiation begins to dissipate over time. It is accumulative but early exposure begins to go away before later doses are added on. Hope that makes sense.
Maybe someone else will chime in with a better explanation.
Clarice