"Which Countries Use PAL, NTSC, or SECAM?"
If you are trying to set up a surveillance system, PAL/NTSC cameras/receivers will work anywhere... as long as they are paired with cameras/receivers that use the same format.
BUT the trouble starts if you're trying to pick up TV signals on a car DVD player or television set which operates on a different color format to the one that is most common in the country you are residing in.
AND you can't put a PAL camera with an NTSC recevier, and vice versa.
Click on the links below to find out more about the different color formats and the regions they work in:
Where in the world are you? This is a visual guide to where each of the formats is used across the globe
TELEVISION COLOR STANDARDS:
Use ctrl-F in your browser to search for particular countries in the list below.
COUNTRIES USING PAL...
PAL B, G, D, K or I
PAL-M (You crazy guys)
- Brazil (simulcast in ISDB-T will start in December 2007 until 2016)
- Laos (also uses SECAM)
PAL-N and PAL-NC (You even more crazy guys)
Countries and territories that once used PAL, but don't use it for TV any more (Yay!)
COUNTRIES USING NTSC...
- Canada, NTSC broadcast to be abandoned by August 2011, simulcast in ATSC 
- Mexico, NTSC broadcast to be abandoned by 2022, simulcast in ATSC
- United States, NTSC broadcast to be abandoned in February 2009, simulcast in ATSC
Central America and the Caribbean
Other Pacific island nations
Historic (used NTSC experimentally before adopting PAL)
- Fiji (Historic; used before 1989, Fiji has used PAL since 1990)
COUNTRIES USING SECAM...
The above information is sourced from Wikipedia:
Visit the Chinavasion.com pages below to find out more about analog transmission standards and see how Chinavasion can help you get the equipment in the format that you want.