AN72 - firstly, the radar is so-called 'low energy' which is a better start than the old sets. However, any radiation is best avoided. If you were not in front of the scanner I would suggest you probably only acquired a small amount of 'spillage' radiation. Scanner motion on all 737 Classics and onwards is audible, and I guess you will listen for it now?
Apologies on behalf of unknown incompetent pilots that you have this possible exposure and concern. I would suggest you ask for medical advice through either your company or union or both if you have one. I'm sure you'll be fine.