Low white cell blood count -radiation?

I, subsequent to very recent radiation and hormone therapy for localized prostate cancer, visited my internist for annual comprehensive bloodwork and physical. During this visit, he advised that my white blood cell counts were quite low, well below “low minimum”. He was aware of my PC therapy.
I think it’s pretty obvious that this would open me up to troubles with any type infections as these cells provide first defense against same.
Shouldn’t this have been made clear to me as a likely consequence of treatment? I guess I’m just surprised as it’s not in much of the literature. It was brought up on this board but nothing discussed since 2023, so…….