That sounds like a really delicate operation. Glad you recovered.

I think the difference between proton and photon is not something I am capable of explaining.....

.....I did a quick google search and found this article:
https://www.moffitt.org/taking-care-of-your-health/taking-care-of-your-health-story-archive/proton-radiation-therapy-vs.-photon-radiation-therapy-for-standard-care
Good luck.