Question: are radioactive camera lenses dangerous?
Answer: Okay, time to get serious. A radioactive lens containing Thorium emits around 0.01 mrem/hr. ... So, even if you had your Thorium lens with you at all times (and I assume you're not that attached to it), you'd receive a yearly dose of 87.6 mrem from it. In conclusion – no, you can't get sick or die from radioactive lenses.