rel="alternate" or rel="nofollow" for PDF format of page ?

Hi guys,
I have a page with text that people can download in pdf format by clicking on a certain link..
Is it best to use rel="alternate" for that link to let Google know it is an alternate version of the page
OR
is it best to use rel="nofollow" in this case so that Google does not follow the link at all ?
Thanks
Amator

 

Does anybody have an idea ?

 

if the PDF on your own site, use alternate or use nothing
if the PDF on others site, if trust as above, if not, use nofollow

 

Thanks for your answer.
The pdf is on my site. You suggest to use nothing. The pdf if an almost an exact copy of the page. Is it not bad if I put a dofollow link ?

 

Nofollow will not prevent from google to follow the link. It is just for PR juice.

 

i have never heard of using rel feature for pdf .... if anybody can enlighten it would be useful

 

that is html code?

 

don't use the nofollow if you don't need or understand why.
if you have a good- 2,000 word white paper or manual- let google scan it.

it won't placed the PDF on the first page, and no reduce to your PR juice so don't worry...

 

I am not sure if you understand my worry. The worry is duplicate content, as mentioned before the pdf is almost an exact copy of the html page.
What is in that case the best option ?