Not nine radio buttons…
I recommend you either follow the guideline or use a different solution.
For radio buttons, Microsoft has this guideline for radio buttons:
Is the number of options between two and seven? Since the screen space used is proportional to the number of options, keep the number of options in a group between two and seven. For eight or more options, use a drop-down list or single-selection list.
In the same guideline, Microsoft acknowledges that a drop-down list performs differently than a set of radio buttons:
Would a drop-down list be a better choice? If the default option is recommended for most users in most situations, radio buttons might draw more attention to the options than necessary.
Consider using a drop-down list if you don't want to draw attention to the options, or you don't want to encourage users to make changes. A drop-down list focuses on the current selection, whereas radio buttons emphasize all options equally.
Consider a drop-down list if there are other drop-down lists on the page.
You might decide not to use a drop-down list, either.
A third option: the single-selection list
Other answers have compared radio buttons to a drop-down list, but there's a third option: the single-selection list:
The user can select one value, not multiple.