Take the first roll to a nearby airport and put the film on the conveyor belt at the x-ray baggage check . Lastly, develop the photos. After reviewing your prints you should notice a large white line appearing on most of the x-rayed images. These white lines indicate the areas of the film that were exposed to x-rays. It isn't a tangible force.
Heat is the result of a chain of events that increase an atoms activity.
It can pass through the roll's covering to damage the film, but it can take hours, sometimes days of exposure to do this. More often than not it will simply degrade the film's color quality. Leaving your film unprotected in your car during the summer months can sometimes turn those bright yellows into bland browns. It is recommended that you place your film in the refrigerator until you use it or get it processed.