robots noindex question

I have a blogger blog. I want to add some internal links. Lets say that I am writing posts about types of radiation, and I want to give add the link of same domain page "radiation" to this post (i.e. 1 post has other post link), like most of the wiki-pages have. Will it hurt my SEO (multiple pages indexing etc)? If yes, then what code should I add to my robots.txt file??