As far as I know, there aren't any little gadgets like the badges worn in some jobs that will tell you how much X-ray radiation the gadget has been exposed to. I originally wanted to come up with the product myself (I thought of it about 10 years ago), but it wouldn't be such a mass market thing now, so I'm asking if anyone has an idea. What I'd like to have figured out is whether there's an amount of radiation that can be considered "safe" and an amount that's just before it isn't safe (since exposure is cumulative) and then have a little card-type thing that can go in with film that's getting X-rayed (yes, different ones for different speeds or a sliding scale on the card). As long as you use the same card with the same rolls of film (so basically one card per trip), you'd have an idea if your film is getting close to too many X-rays. Not that this is necessarily a viable business opportunity, but maybe as an off-shoot from regular radiation badges? This would help with the fact that not all machines at airports are exactly the same or running at the same speed. 'cause I hate when the TSA people say "Oh, 400 speed film is perfectly safe" It might be the first time, but that doesn't mean you can toss a roll of it through 5 times and it'll be fine.