@pbmurf Welcome to Mayo Connect. Your discussion title piqued my curiosity because I have bilateral hip implants (though I have no Prostate gland 😉)
Here is what Johns Hopkins has to say about it:
https://www.hopkinsmedicine.org/health/conditions-and-diseases/prostate-cancer/proton-therapy-for-prostate-cancer#
You may want to check with a specialized cancer treatment center in a large teaching hospital, or with Mayo in Jacksonville, to see if any workaround has been developed.
Sue