PET Radiation Safety. Academy of Molecular Imaging. Robert E. Reiman, MD, ABNM Radiation Safety / OESO Duke University Medical Center. Topics to Consider. General Regulatory / Practice Considerations Why is PET Different? External Radiation Hazards Measures to Reduce Personnel Dose.
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Academy of Molecular Imaging
Robert E. Reiman, MD, ABNM
Radiation Safety / OESO
Duke University Medical Center
Hot Lab, Scanner Areas
> 500 rem/hr
> 100 mrem/hr
Wear with the label on the palmar (inside) surface of the hand
Wear at the chest or waist
Technologists should minimize the time spent in close proximity (less than two meters) from the patient.
Positrons can be stopped by 2 - 5 mm Lucite. Gammas require a high-Z material. Neutrons require high hydrogen content (paraffin or the “waters of hydration” in concrete).
“Rule of Thumb: Shadow Shield provides maximum reduction of about 1 part in 400
The “lead” aprons used in diagnostic radiology have about 0.5 mm lead equivalent. These are protective at energies under 100 KeV, but are nearly useless against annihilation photons.
100 KeV: Transmission = 4.3 %
511 KeV: Transmission = 91.0 %
Tongs to Maximize Distance
Syringe Shields (Tungsten and Lead Glass)
Nuclear Medicine procedure doses courtesy: Russell J, Sparks R, Stabin M, Toohey R. Radiation Dose Information Center, Oak Ridge Associated Universities.