PLU codes beginning with "3"

Does anyone know what a produce code beginning with 3 stands for? I've seen a couple of blogs stating that the 3 indicates irradiation but nothing concrete about it.
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Four digit codes from 3000 - 4999 are for standard produce. If there is a 9 first and then the four digits then it is organic produce.
The International Federation for Produce Standards site says 8 in front is for GMO. They don't have anything listed about irridiated produce. http://www.plucodes.com/produce.aspx
marcella
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