International intercomparison exercise of airborne gamma-spectrometric systems of the Czech Republic, France, Germany and Switzerland in the framework of the Swiss exercise ARM17

作者：Gernot Butterweck, B. Bucher, Lubomír Gryc, Christophe Debayle, Christopher Strobl, Stéphane Maillard, Michael J. Thomas, Alexandra Helbig, Inge Krol, Sonia Chuzel, Céline Couvez, Marcel Ohera, Ladislaus Rybach, Cristina Poretti, Bénédicte Hofstetter-Boillat, Sabine Mayer, Gerald Scharding · 发表于：PSI-Bericht · 年份：2018 · DOI：10.55402/psi:34959 · 被引用次数：6 · 研究领域：Radioactivity and Radon Measurements、Radioactive contamination and transfer、Geochemistry and Geologic Mapping

Participants in this international intercomparison exercise performed from June 26th to June 30 th were seven measuring teams of the Czech Republic, Germany, France and Switzerland. In advance to the intercomparison exercise, two measuring areas around the nuclear power plants Gösgen and Mühleberg were inspected by Swiss teams CH01 and CH02 on June 22nd and June 23rd following a bi-annual schedule on behalf of the Swiss nuclear safety inspectorate (ENSI). No artificial radionuclides were detected outside the premises of the power plants. The main measurement task for the international exercise tried to simulate a scenario in which the deployment of airborne gamma-spectrometry is essential and international support would be requested. The scenario assumes a theft of a strong radioactive 137Cssource. The get-away car including the empty source shielding was found abandoned by the police, suggesting that the thieves took flight on foot taking the source with them. Police investigations determined a perimeter inside which the thieves and the source should be located. The associated area adds up to seven percent of Switzerland (2900 km2). Two 137Cs-sources were placed in the search area. Both sources were identified and located during the exercise. Additional tasks consisted in combining the measured data in the source search area into composite maps of the natural radioactivity and in several reference areas for a direct comparison of system performance. The results of the measur...