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Defibrillator Implants:
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  1. Defibrillator Implants: Occupational Exposure to Electromagnetic Radiation Bruce Murdoch PhD CHP CLSO Argonne National Laboratory Argonne, IL USA btmurdoch@anl.gov AIHce 2011, Portland OR Roundtable Session RT 201

  2. Typical ICD Device Dimensions: 2” X 2.5” X 0.2” AIHce 2011, Portland OR

  3. Implant Placement EM Vulnerabilities Leads Control Unit Failure Modes False Trigger Stopping Source: www.defibrillator-help.com AIHce 2011, Portland OR

  4. CASE STUDYWhere? APS (Advanced Photon Source)Who?Accelerator Operator w/ICDWhy? Work Clearance AIHce 2011, Portland OR

  5. AIHce 2011, Portland OR

  6. APS Control Room AIHce 2011, Portland OR

  7. Manufacturer Test Standard • ANSI/AAMA PC69 - 2007 AIHce 2011, Portland OR

  8. Typical Manufacturer (Medtronic) Exposure Limit Recommendations • Static B-Field B ≤ 0.5 mT (5G) • 50/60 Hz B ≤ 0.1 mT (1G) E ≤ 6000 V/m • ≥ 10 kHz B ≤ 1.25 mT (12.5 G) • R-F E-Field (≥ 150 kHz) E ≤ 100 V/m AIHce 2011, Portland OR

  9. ACGIH 2010 TLV Book Exposure Limit Recommendations • Static B-Field B ≤ 0.5 mT (5G) • ELF (5 Hz–2kHz) B ≤ 0.1 mT (1G) • VLF (2kHz–400 kHz) No recommendation • R-F (100 kHz–3GHZ) E ≤ 3-10 V/m AIHce 2011, Portland OR

  10. Static B-Fields MetroLab Model ETM-1 3-Axis Magnetometer AIHce 2011, Portland OR

  11. ELF Holaday HI-3627 ELF Magnetic Field Meter w/ HI-3602 Probe 30 Hz – 2 KHz AIHce 2011, Portland OR

  12. VLF Holaday HI-3637 VLF Magnetic Field Meter w/ HI-3091 Probe 2kHz – 400 KHz AIHce 2011, Portland OR

  13. R-F Narda NBM-520 RF Survey Meter w/ EF3091 E-Field Probe 100 kHz – 3 GHz AIHce 2011, Portland OR

  14. Spectrum Coverage RF AIHce 2011, Portland OR

  15. The Instrument Ensemble AIHce 2011, Portland OR

  16. Survey Plan • Daily Control Room work area • Weekly maintenance walkthroughs • ESH Coordinator guidance • 84 specific survey locations plus area sweeps • Full spectrum survey at each location AIHce 2011, Portland OR

  17. Control Room Panels AIHce 2011, Portland OR

  18. Electrical Distribution Room ELF: B ≤ 0.4 G @ 6 inches from transformer RF: E ≤ 4 V/m AIHce 2011, Portland OR

  19. Mezzanine RF System Freq = 325 MHz E(RF) up to 3.5 V/m @ 6 in. AIHce 2011, Portland OR

  20. Power Control Systems AIHce 2011, Portland OR

  21. Pulser Power Transformers AIHce 2011, Portland OR

  22. RF Distribution Waveguides Freq = 325 mHz AIHce 2011, Portland OR

  23. Linac Klystrons Freq = 2.8565 GHz E(RF) = 2 V/m @ 1 ft AIHce 2011, Portland OR

  24. Case Study Results • Employee barred from • Fundamental RF Room: 7 V/m RF • Electrical Distribution Room: 4 V/m RF • Cautions • Some instrument racks: 4 V/m RF @ 12” • Some waveguides: 3.5 V/m RF @ 12” AIHce 2011, Portland OR

  25. Credits • Technical Assistance • Mary Malik • Adam Sauter • Photography • George Joch • Edmund Chang AIHce 2011, Portland OR