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Factors affecting the trapping performance of xenon holdup—filters in nuclear medicine applications
Author(s) -
Bolmsjö M. S.,
Persson B. R. R.
Publication year - 1982
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.595139
Subject(s) - xenon , trap (plumbing) , charcoal , activated charcoal , trapping , moisture , nuclear engineering , materials science , environmental science , radiochemistry , chemistry , nuclear physics , adsorption , environmental engineering , physics , engineering , composite material , ecology , metallurgy , biology , organic chemistry
Activated charcoal traps are used in nuclear medicine departments to capture exhaled radioactive xenon gas. In the present study, the trapping performance of charcoal was investigated for different physical qualities in experimental and clinical situations. Various factors affecting the trapping capacity are identified, such as the charcoal mass, moisture and carbon‐dioxide concentrations in the sweep gas, gas‐flow rate through the trap, and temperature. Improper drying of the exhaled air prior to passage through the charcoal bed appears to be a critical factor, leading to a much earlier breakthrough of xenon. Commercial xenon traps intended for ambient temperature operation were found to be useful only for a limited number of patients due to an early breakthrough point. By refrigerating the trap, however, a much larger capacity was achieved. If correctly managed, xenon traps constitute a useful alternative for isolating radioactive xenon wastes in clinical and experimental applications.