Upon acquisition of an additional source or sources. Upon moving the source or sources to a different location. Upon a change in the type of shielding, shielding configuration, or shielding thickness. The instrument selected for survey must have a current calibration and be calibrated with a source of the same or similar energy.
Instruments calibrated electronically are unacceptable for exposure rate surveys.
The results of each survey must be documented. Records of surveys must be retained until termination of Old Dominion University's US NRC and Commonwealth of Virginia licenses. Date the survey was performed. Make, model, and serial number of each portable survey instrument. Calibration date for each portable survey instrument.