Yeah it'll most likely be the radiation from it. Unfortunately, they are not always avoidable.

Perhaps you had a lot more in one session this time? Or maybe it was the area where they were done that did it.

Maybe you could help some of this by taking antioxidants (vitamin C, E, selenium) and having epsom salt baths. Epsom salt baths can help pull toxins out via the pores and apparently can help neutralise some. The magnesium from epsom salts is very helpful for many things also.

Just some suggestions. May not be of great help, but it's worth a shot!