Is my lens radioactive?

I just recently got my hands (yesterday) on a Sears/sekor sx auto 55mm f/1.4 converted to Nikon F mount with full infinity focus and no aperture problems, all in good conditions and a low price. At first glance I couldn't help but to notice a yellowish/golden tint on both rear and front elements that is only noticeable from certain viewing angles. There was no light transmission reduction or perceptible yellowing or WB change on final image.

I know Mamiya's 55mm 1.4 sekor sx do have thoriated glass in them, and since this is (AFAIK) a rebranded Sears version of said lens I'd suspect it does too. But i can't seem to find any concrete information on this particular lens. I'd like to know whether I should take "extra care measurements" with this lens or not.