Campus Safety

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Appendix No. 7

Radiation Generating Device Survey Methods

Revision 0 (8/2003)

  1. PURPOSE
    1. This procedure describes the survey methods to be employed when performing radiological surveys of radiation generating machines.
  1. PRECAUTIONS AND LIMITATIONS
    1. Radiological surveys of radiation generating devices must be conducted by individuals who have been trained in the following areas:
      1. Proper selection and use of radiation survey instruments
      2. Proper techniques for the survey of radiation generating devices
    2. Prior to performance of radiation surveys, all trained individuals will be qualified and designated in writing by the Radiation Safety Officer for Juniata College.
  1. EQUIPMENT AND SUPPLIES
    1. 3.1 Calibrated survey meter with a thin window GM detector.
    2. 3.2 Calibrated ionization chamber or dose rate meter
    3. 3.3 Radiation survey documentation
  1. REQUIREMENTS
    1. Surveys of radiation generating machines shall be conducted under the following conditions:
      1. Upon installation of the equipment.
      2. At least once every 12 months as part of the annual radiation safety survey.
      3. Following a change in the initial arrangement, number of type of local components in the system.
      4. Following maintenance requiring the disassembly or removal of a local component in the system.
      5. During the performance of maintenance and alignment procedures if the procedures require the presence of a primary x-ray beam when a local component in the system is disassembled or removed.
      6. When a visual inspection of the local components reveals an abnormal condition.
      7. When the machine is operated in a manner other than the routine manner.
  1. INSTRUCTIONS
    1. Review the previous survey record for the generating device.
    2. Have the device energized.
    3. Ensure that a warning light(s), bearing the words "X-Ray On", is illuminated when x-ray tube is energized. CAUTION: DO NOT PUT HANDS INTO PRIMARY BEAM!
    4. Locate all beam and scatter paths using a meter with a thin window GM tube.
    5. Perform a survey at 5 cm from the device or device enclosure.
      • IF dose rate exceeds 2.5 mrem/hr. from source housing OR dose rate exceeds 0.5 mrem/hr. from device enclosure
        • THEN Record results on the radiation survey form. Post device as "DO NOT USE". Shut down the device and notify the Radiation Safety Officer.
      • IF dose rate is less than or equal to 2.5 mrem/hr from source housing AND dose rate is less than or equal to 0.5 mrem/hr from device enclosure
        • THEN Record results and continue with the survey
    6. Ensure that warning signs & labels bearing the words "Caution - High Intensity X-Ray Beam" has been placed on the x-ray housing
    7. Ensure that warning signs & labels bearing the words "Caution Radiation - This Equipment Produces Radiation When Energized" have been placed near any switch that energizes an x-ray tube.
    8. Turn power off and complete the radiation survey form.
    9. Return completed survey form to the Radiation Safety Officer for review and approval.