title: 99Tc in surface air samples during the years 1965-1967.
abstract: In this work, 99Tc activities in atmospheric filters taken during the years 1965, 1966 and 1967 are measured on a monthly or bimonthly basis. The results show a clear yearly pattern of the activities with a maximum below 3 mBq/1000 m3 at the end of each summer, probably related, in a non trivial way, to meteorological factors. Our atmospheric 99Tc data add a more detailed structure to previously published fallout curves.
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D000396:Air Pollutants, Radioactive / Q000032:analysis*; D011847:Radioactive Fallout / Q000032:analysis; D013030:Spain; D013667:Technetium / Q000032:analysis*
chemical_list: D000393:Air Pollutants; D000396:Air Pollutants, Radioactive; D011847:Radioactive Fallout; D013667:Technetium