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Journal of Nuclear Medicine Technology

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OtherRADIATION SAFETY

133Xe Contamination Found in Internal Bacteria Filter of Xenon Ventilation System

Michael T. Hackett, Judith A. Collins and Rebecca S. Wierzbinski
Journal of Nuclear Medicine Technology September 2003, 31 (3) 170-172;
Michael T. Hackett
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Judith A. Collins
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Rebecca S. Wierzbinski
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  • FIGURE 1.
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    FIGURE 1.

    Bacteria filter (arrow) (15 cm from filter inlet to filter outlet, 9-cm maximum diameter) inside xenon ventilation system. CO2 absorber is located in canister directly below filter. Filter and CO2 absorber are in constant contact with 133Xe in ventilation system. Moisture absorber is located in canister directly across from CO2 absorber canister. Moisture absorber comes into brief contact with 133Xe only when system is evacuated or during washout phase of ventilation study. During that time, 133Xe is trapped in internal shielded xenon filter (i.e., activated charcoal).

  • FIGURE 2.
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    FIGURE 2.

    Linear regression analysis between maximum surface-radiation level and estimated 133Xe activity in each bacteria filter immediately after removal from xenon ventilation system.

  • FIGURE 3.
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    FIGURE 3.

    Percentage of activity remaining in bacteria filter based on initial decay-corrected scintillation camera counts versus time after filter removal.

  • FIGURE 4.
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    FIGURE 4.

    Images of typical bacteria filter after removal from xenon ventilation system. Top left is immediately after removal. Top right is 0.3 d after removal, with 75% of 133Xe activity remaining based on decay correction. Respective left and right bottom images are 3 and 7 d after removal, with 39% and 24% of 133Xe activity remaining based on decay correction. Two hottest bands of activity correspond to 2 polyurethane adhesive areas in filter.

  • FIGURE 5.
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    FIGURE 5.

    Cross-section of bacteria filter. Polyurethane adhesive area (open arrow) toward filter inlet is circular, with 6-cm diameter and 3- to 5-mm thickness. Other polyurethane adhesive area (solid arrows), toward filter outlet, is doughnut shaped with 4-cm inner diameter, 7.5-cm outer diameter, and 4- to 5-mm thickness. Fiberglass filter medium is between and attached to 2 adhesive areas so as to secure it to polypropylene filter housing.

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Journal of Nuclear Medicine Technology: 31 (3)
Journal of Nuclear Medicine Technology
Vol. 31, Issue 3
September 1, 2003
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133Xe Contamination Found in Internal Bacteria Filter of Xenon Ventilation System
Michael T. Hackett, Judith A. Collins, Rebecca S. Wierzbinski
Journal of Nuclear Medicine Technology Sep 2003, 31 (3) 170-172;

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133Xe Contamination Found in Internal Bacteria Filter of Xenon Ventilation System
Michael T. Hackett, Judith A. Collins, Rebecca S. Wierzbinski
Journal of Nuclear Medicine Technology Sep 2003, 31 (3) 170-172;
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