I expect the gel to distort and become crisp and breakable so would either put absorbent paper on one side of the gel and leave to dry as Laurence says.

or soak the gel in dilute glycerol and dry on a membrane to keep it flexible.

Or southern blot the agarose onto nitrocellulose or nylon membrane and expose the membrane to the film,

Thank you Laurence and Paul!

I tried drying a gel in the fume hood overnight and indeed it got wrinkly on the upper side and bands distorted.

Will try blotting just to stay on the safe side.

cheers 

Hi Seomum,

May I know that the other method to dry the agarose gel on blotting paper worked with your sample, condition suggested in the above paper which you mentioned.

thanks in advance

Hi Pratibha, simply drying the gel on blotting paper didn't work well for me. So I ended up doing a standard blot, as with Southern/Northerns. It created a lot of radioactive mess but still gave the cleanest result. Good luck!