Can I find silent bits?

I know I can create silence from selected audio passages in Sonar, but is there a way in Sonar to FIND silent bits.  While Sonar is helpful at editing the audio in various ways,  I am mulling through hours of radio shows from the 1970s transferred to digital audio and I need to remove ads that had silence before and after them - is there a way to quickly identify all bits of silence so I may quickly identify the ads and delete them?  If not, can you recommend any available program out in the market that could accomplish this task?  Thanks.

You could use Process > Apply Effect > Remove silence, but it will only delete the silence (threshold user definable), it won't delete the actual ads.