Hi Clare,
Its difficult to comment without knowing more about your husbands diagnosis, but normally if you have surgery the hope is that you will not need radiotherapy. However, if they don’t get all the cancer during the Op and his PSA is not undetectable after the Op, he might require SRT(Salvage RadioTherapy) and also HT (Hormone Therapy)
if you can, it would be helpful if you could upload more details about your husbands diagnosis into his profile.
Good luck on your journey.
Derek