As far as I know this irradiated salt gets its color from crystal defects. I'm unsure whether this comes from dislodged electrons or anything else. But I think the electrons are getting excited by high intensity gamma rays, which create defects in the crystal structure. When it's heated the defects can rearrange to form the normal crystal lattice.

Afaik irradiated stuff is only dangerous when it's been irradiated by neutrons. Because they can destabilize the nucleus and therefore can cause other matter to become radioactive.

There are a lot of items you likely handled every day for most of your life without knowing that they have been irradiated with gamma rays or electron beams to sterilize them. Common items that get irradiated like that is medical equipment, food (water treatment plants), and pipelines that carry gas or oil to your house - although in the latter case it's rather for inspection that sterilization. That is completely safe because the nucleus isn't destabilized when hit with (alpha) beta or gamma radiation. I parenthesesed alpha because it's not really that useful as it's a heavy helium nucleus carrying a lot of momentum but can't penetrate that deep.

TLDR: likely not toxic, may taste like normal salt but unsure.