Plastic or Metal Port on Expander?

[SonofaSurvivor]

Hello all, I am a SonofaSurvivor (optimistically, of course). My mom was first diagnosed 2 months ago (Her2 positive) and is having a masectomy in 2 weeks. She is to have a expander put in. We have read about the difference of metal vs plastic ports used via breastcancer.org. We are not sure if she will have radiation or not until post surgery. Is it true plastic is preferred if radiation is to occur? The PS said he never even heard of plastic! And was just going to use metal...now he says maybe can use a special stainless steel? Anyone have better information and what questions to bring up?

Thanks all!