Can i have a second partition with a full system in it, encrypted with FileVault/Truecrypt/Whatever?

Can i have a second partition with a full system in it, encrypted with
FileVault/Truecrypt/Whatever?

I would like to have a second partition in my laptop. The second
partition, differently from the first one, should be encrypted at a boot
level. It will contain all my work stuff.
Is it possible?
Is it secure?