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99Tc in surface air samples during the years 1965-1967
The International Journal of Applied Radiation and Isotopes
|October 1, 1984
Summary
Technetium-99 (99Tc) activities in atmospheric filters reveal a distinct yearly pattern. These findings provide a more detailed understanding of fallout curves, likely influenced by meteorological factors.
Area of Science:
- Environmental Science
- Radiochemistry
- Atmospheric Science
Background:
- Atmospheric 99Tc measurements provide insights into global fallout.
- Previous studies have established general fallout curves.
Purpose of the Study:
- To measure 99Tc activities in atmospheric filters from 1965-1967.
- To analyze seasonal patterns and their relationship with meteorological factors.
- To refine existing fallout curve data.
Main Methods:
- Monthly or bimonthly sampling of atmospheric filters.
- Measurement of 99Tc activity concentrations.
Main Results:
- A clear yearly pattern in 99Tc activities was observed.
- Activity peaks occurred at the end of each summer, below 3 mBq/1000 m3.
- The observed pattern suggests a non-trivial relationship with meteorological factors.
Conclusions:
- The study provides detailed temporal data on atmospheric 99Tc.
- Findings enhance the structural understanding of published fallout curves.
- Meteorological influences on 99Tc distribution warrant further investigation.