NTSC or PAL

[muphex]

Right so I have a pal system (UK) and Pal TV which handles NTSC and pretty much whatever you throw at it and I was wondering if there's any way that I can tell what signal a discis using so I can label them. Point is I take the dreamcast away with me and the tv I use there doesn't use scart therefore doesn't accept NTSC so I need to know which I can take to use there, is there anyway of telling either as the game is running or would I have to examine the disc in some way to tell what it's going to run at.

Cheers in advance!