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- W2112953669 abstract "Human pulmonary retention of 35 nm 99mTc-labeled carbonaceous particles, produced with a modified Technegas generator, was followed for 24 h using a gamma camera imaging technique. Nine healthy subjects and four asthmatics inhaled the test particles. Particle labeling stability was tested in vitro during 48 h. We also measured in vivo leaching in blood and in urine for 24 h. One additional subject was exposed to particles with unstable labeling. There were no significant differences between healthy and asthmatic subjects in any of the parameters studied. Particle retention after 24 h was 102% (SD ± 4.7). Cumulative in vitro leaching of 99mTc activity from the particles was 1.7% (±1.1) after 24 h. In blood samples, 80 min after exposure, 1.1% (± 0.4) of initially deposited activity was detected and 91% of the activity was not bound to particles. In urine sampled during the first 24 h after exposure, 3.6% (± 0.9) of lung deposited activity was detected. Lung retention was 30% after 1 h in the subject exposed to the leaching aerosol (n = 1). Thirty-one percent of the deposited activity was detected in the blood after 80 min and 80% was not bound to particles. Fifty percent of the activity was excreted with urine within 24 h. On gamma camera images the activity visibly translocated from lungs to thyroid and gastrointestinal tract. In conclusion, over a 24-h period there was no significant translocation of inhaled 35-nm particles to the systemic circulation." @default.
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- W2112953669 date "2006-01-01" @default.
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- W2112953669 title "No Significant Translocation of Inhaled 35-nm Carbon Particles to the Circulation in Humans" @default.
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- W2112953669 doi "https://doi.org/10.1080/08958370600748455" @default.
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