How to Identify unused columns in a table

Hiiya..
Is there a way to find out that following columns of table X,Y, Z have never been used. So that, I can check with the FCs and mark them un-used (using ALTER TABLE).
I don't want to go through every line of (avlbl) PLSQL code to identify that so and so column of so and so table has never been used. Is there any view or any sys proc/pkg using which I can identify them.
TIA

Guido
Not getting you exactly. What I am doing is pick all the columns one by one and search in all_source (like where TEXT like %COLUMN_NAME%). Now what about 'AND <UnusedColumn> IS NULL'
Sidhu

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