There's two mods out there
"Factorio and Conquer" https://mods.factorio.com/mod/Factorio-Tiberium
And just "Tiberium" https://mods.factorio.com/mod/ichor
I'm subscribed to the former, myself as it has more tweaks and tie-in mods I like

If you're not familiar with Command and Conquer, Tiberium is a radioactive element that spreads by consuming/converting other resources, it's highly radioactive and seems to mutate things with a degree of consistency, similar to how your mod would seem to affect biters. The most common mutation in Tiberium's case is turning creatures into a blob of cancerous goo, but sometimes you get the more "phazon" style mutations that just enhance their victim.
Reason I bring it up is these mods seem to have their own methods of damaging things near them as they irradiate and try to convert materials into more Tiberium, but maybe a unified standard for radiation is the way to go?
Does your ambition compel you to do that or are you just trying to have some fun?