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Journal of Nuclear Medicine Technology

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Student Paper

Technetium-99m DTPA Aerosol Contamination in Lung Ventilation Studies

Daniel A. Williams, Christina Carlson, Kathleen McEnerney, Ellen Hope and Carl K. Hoh
Journal of Nuclear Medicine Technology March 1998, 26 (1) 43-44;
Daniel A. Williams
University of California Los Angeles and California State University Dominguez Hills, California
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Christina Carlson
University of California Los Angeles and California State University Dominguez Hills, California
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Kathleen McEnerney
University of California Los Angeles and California State University Dominguez Hills, California
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Ellen Hope
University of California Los Angeles and California State University Dominguez Hills, California
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Carl K. Hoh
University of California Los Angeles and California State University Dominguez Hills, California
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Abstract

Contamination of working areas by 99mTc DTPA aerosol is of concern to nuclear medicine technologists. This study sought to determine the extent of 99mTc DTPA contamination to technologists, and to localize sources of aerosol leakage so that methods could be identified that would minimize contamination.

Methods: Fifty to eighty millicuries 99mTc DTPA, diluted to a volume of 4–5 ml with normal saline, were injected into the nebulizing chamber of two commercially available inhalation aerosol systems. The patient’s nostrils were clamped and a damp washcloth was wrapped around the patient’s mouth. An alcohol swab was placed in the exit port of the exhaust filter in each delivery system, and the technologist involved wore a face mask during the inhalation phase. The patient breathed DTPA-labeled aerosol by mouth until the counting rate in the lungs was four times greater than the counting rate from the pulmonary perfusion phase. Connecting joints of the delivery system were then wipe tested. Last, a Geiger-Mueller detector (pancake probe) was used to survey all device components. Readings above 0.05 mR/hr were considered contaminated.

Results: The patient was the greatest source of leakage as determined by the damp washcloth, followed by the joints of the tubes of the delivery system and, finally, the system’s exhaust filter. Contamination readings from face masks worn by technical personnel during the lung ventilation studies were slightly greater than 0.05 mR/hr.

Conclusion: The findings support trace levels of contamination to both the technologist and room while performing 99mTc DTPA aerosol ventilation studies. Comparative data using the two delivery systems revealed little difference in sources of leakage and little variation in contamination measurements.

  • technetium-99m DTPA aerosol
  • contamination
  • radiation safety
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Journal of Nuclear Medicine Technology: 26 (1)
Journal of Nuclear Medicine Technology
Vol. 26, Issue 1
March 1, 1998
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Technetium-99m DTPA Aerosol Contamination in Lung Ventilation Studies
Daniel A. Williams, Christina Carlson, Kathleen McEnerney, Ellen Hope, Carl K. Hoh
Journal of Nuclear Medicine Technology Mar 1998, 26 (1) 43-44;

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Technetium-99m DTPA Aerosol Contamination in Lung Ventilation Studies
Daniel A. Williams, Christina Carlson, Kathleen McEnerney, Ellen Hope, Carl K. Hoh
Journal of Nuclear Medicine Technology Mar 1998, 26 (1) 43-44;
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Keywords

  • technetium-99m DTPA aerosol
  • contamination
  • radiation safety
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