what does it mean by blackberry device radio? how do i turn it off and on?

Radio means the type of signal that gets transmitted to your carrier (like AT&T or T-Mobile), this includes things like phone calls, text messages, emails, internet, etc. If you turn off "radio", you are turning off everything I just mentioned.

EDIT: Blackberrys give off the lowest amount of radiation compared to a lot of other popular phones. There is no point in turning off "radio" because it will still give off small amounts of radiation regardless (like every other phone). You might as well turn the entire phone off and never use it ever again.
 
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