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US Navy NR Machinist's Mate nd Class Stan Proctor from Crofton Md. inserts the calciumfluoride crystal from ThermalLuminescent Dosimeter TLD. en Arabian Gulf Jan Machinist's Mate nd Class Stan Proctor from Crofton Md inserts the calciumfluoride crystal from ThermalLuminescent Dosimeter TLD into TLD reader to record radiation exposure