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Those of us who were involved in radar research in Radiation Labs, or sonar and atomic energy in the years following: early cancer studies with radioactive substances,etc. could have picked up a few waves of this or that.. Of course all precautions were observed in the labs, and researchers were tested periodically for exposure. Of what actual significnce it has in PD, I know not. [log in to unmask] (Mary Manfredi)