Can listening to your iPod too much cause radiation?
No, I have never heard that. I listen to my iPhone and have my earbuds in whenever I'm awake. The only risk is hearing loss, if the volume is too loud.
There is no proof it causes radiation as all products that are sold to the public must pass quality checks which have been put in place by the government. However listening to loud music for a long time on your iPod can cause ear problems.
If you are afraid of radiation, you should not listen to it for long time.