Granting access to AdWords account

[owl921]

I have hired a company to manage and optimize my Adwords account. Naturally they want access to my AdWords and Analytics accounts. I have no problem with that because I can control the level of their access. My adsense account has the same gmail login info though. From what I can tell they would also have access to that. I do not want them to see the adsense account. Is there a way for me to block their access to the adsense account only?
hmmm.

Thanks