title: Airborne surveys of Swiss nuclear facility sites.
abstract: Annually since 1989, biannually since 1994, the environs (approximately 50 km2) of the Swiss nuclear facilities are surveyed (by helicopters) flying the same survey lines. The equipment and the data processing software used for these surveys were built and developed at the Institute of Geophysics, ETH Zurich. For mapping of man-made radiation at or around nuclear facility sites a pixel representation and the MMGC (man-made gross count) ratio is used. So far no artificial radioactivity that could not be explained by the Chernobyl event (1986) or by earlier nuclear weapon tests was detected outside the fenced sites of the nuclear facilities.
authors.affiliation: Institute of Geophysics ETH Zurich, ETH Hoenggerberg, CH-8093 Zurich, Switzerland. rybach@geo.phys.ethz.ch
authors.forename: L
authors.initials: L
authors.lastname: Rybach
authors.forename: B
authors.initials: B
authors.lastname: Bucher
authors.forename: G
authors.initials: G
authors.lastname: Schwarz
mesh_terms: D000398:Air Pollution, Radioactive / Q000032:analysis*; D000401:Aircraft; D003625:Data Collection; D003627:Data Interpretation, Statistical; D016208:Databases, Factual; D005843:Geography; D006801:Humans; D011210:Power Plants; D011834:Radiation Monitoring / Q000295:instrumentation / Q000379:methods*; D011847:Radioactive Fallout / Q000032:analysis; D012984:Software; D013557:Switzerland
chemical_list: D011847:Radioactive Fallout