WRT thoriated tungsten grinding, read this rant:
Yes, you are over-reacting. You will pick up more alpha particles in your lungs from walking by someone who is smoking then from spending all day in your shop. If your job title was "tungsten sharpener", and that was all you did all day long, you probably still would not have a problem. Keep the grinding dust in your shop at a manageable level. Keep the dust out of your lungs by wearing a respirator if you are going to be doing alot of grinding. If you use a bench ghrinder for sharpening, clamp a dust collection tube on the discharge port of your grinder and put it in a bucket so all the dust collects in one place. Or use ceriated tungsten. But I will keep using thorated.