@Spirit-Harmony many of the people on here have had great success using MooGoo during radiotherapy. I bought Dermaveen which worked well for me .
Only thing I didn’t like was Sorbolene and noticed few others at my clinic used it either as was supplied in the change rooms for after treatment. The clinic also supplied as an alternative a herbal cream which I and everyone else liked as it was always running out .The clinic in fact stopped supplying Sorbolene and replaced it with Cetaphil.You will need to cream 3 times per day and more if you need it and I was told for 3 months after radiation ended.
Be aware UV seems to activate the region - we went to Cairns a month after treatment and I had to be very careful in the sun.
I also wore front opening Target postop bras during treatment which made things a bit easier.
I had 16 rounds of radiotherapy, am very fair and my skin came thru ok.