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Cancer Epidemiology Biomarkers & Prevention, Vol 5, Issue 2 139-140, Copyright © 1996 by American Association for Cancer Research
ARTICLES |
SC Su, S Garbers, TD Rieper and P Toniolo
Department of Environmental Medicine, New York University School of Medicine, New York 10010, USA.
We examined temperature deviations from the set temperature in specific locations, between-freezer temperature variability, and the effect of defrosting on temperature deviation in a group of 15 upright mechanical freezers, part of a biological sample bank of a large prospective cohort study. By using an Omega Type T Thermocouple Microcomputer thermometer with the freezers set at -80 degrees C, the internal temperature (12 locations in each freezer) ranged from -90 degrees C to -43.5 degrees C. Overall, internal temperatures tended to be appreciably warmer in the upper and front sections of the freezers. Upright front-loading mechanical freezers, which are widely used in research laboratories throughout the world, may not be optimally suited to preserve human biological samples for long-term banking in epidemiology.
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