I suppose and like a lot of things you have to evaluate the risks and do your own thing?
I do remember from school science that the lower end radioactive material had bigger slower particles (is it?) and there was more chance of them colliding (and hence doing damage) inside us, than (what might seem on the outside) to be more nasty stuff?
Some folk are happy to do stuff *no matter*, some wiill pick some middle ground based on their best understanding and advice from others and the rest are just paranoid? ;-)
If someone gave me a Tritium 'torch' I probably wouldn't throw it away but might not keep it in my pocket either ..?
All the best ..
T i m