Mr
Ian Hoffman
(Radiation Protection Bureau, Health Canada, Ottawa, ON, Canada)Mr
Pawel Mekarski
(Radiation Protection Bureau, Health Canada, Ottawa, ON, Canada)
A series of measurements of multiple anomalous treaty relevant radionuclides at several measurement stations in Sweden and Finland, including the Stockholm aerosol sampler (SEP63) in the International Monitoring System (IMS), occurred in the summer of 2020. The cause and source of these radionuclides is still unknown. The laboratory re-measurement of the split IMS sample revealed that one-half of the split sample contained the entirety of the anthropogenic radioactivity - a high degree of sample inhomogeneity due to hot aerosol particles. Using the IMS results and by performing some advanced laboratory coincident measurement techniques, an international, multidisciplinary team started to unravel the details on the nature of this event while also demonstrating the verification benefits of adopting new sample analysis techniques.
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Detections of multiple treaty relevant radionuclides by the IMS and national monitoring networks in June 2020 initiated an event analysis. An international, multi-disciplinary team employed multiple techniques including an advanced laboratory system to characterize this event.
Mr
Ian Hoffman
(Radiation Protection Bureau, Health Canada, Ottawa, ON, Canada)
Mr
Pawel Mekarski
(Radiation Protection Bureau, Health Canada, Ottawa, ON, Canada)
Mr
Kurt Ungar
(Radiation Protection Bureau, Health Canada, Ottawa, ON, Canada)
Ms
Jing Yi
(Radiation Protection Bureau, Health Canada, Ottawa, ON, Canada)
Mr
Adrian Botti
(Radiation Protection Bureau, Health Canada, Ottawa, ON, Canada)
Mr
Michael Cooke
(Radiation Protection Bureau, Health Canada, Ottawa, ON, Canada)
Mr
Alain Malo
(Canadian Meteorological Centre (CMC), Dorval, QC, Canada)
Mr
Nils Ek
(Meteorological Service of Canada, Ottawa, ON, Canada)
Mr
Yves Pelletier
(Meteorological Service of Canada, Ottawa, ON, Canada)
Mr
Chris Cochrane
(Canadian Nuclear Safety Commission (CCSN), Ottawa, ON, Canada)
Mr
Vladimir Khotylev
(Canadian Nuclear Safety Commission (CCSN), Ottawa, ON, Canada)
Mr
Ali El-Jaby
(Canadian Nuclear Safety Commission (CCSN), Ottawa, ON, Canada)
Mr
Anders Axelsson
(Swedish Defence Research Agency (FOI), Stockholm, Sweden)
Mr
Klas Elmgren
(Swedish Defence Research Agency (FOI), Stockholm, Sweden)
Mr
Tomas Fritioff
(Swedish Defence Research Agency (FOI), Stockholm, Sweden)
Mr
Johan Kastlander
(Swedish Defence Research Agency (FOI), Stockholm, Sweden)
Mr
Anders Ringbom
(Swedish Defence Research Agency (FOI), Stockholm, Sweden)
Ms
Catharina Söderström
(Swedish Defence Research Agency (FOI), Stockholm, Sweden)
Mr
Tero Karhunen
(Radiation and Nuclear Safety Authority (STUK), Helsinki, Finland)
Mr
Mikael Moring
(Radiation and Nuclear Safety Authority (STUK), Helsinki, Finland)
Mr
Aleksi Mattila
(Radiation and Nuclear Safety Authority (STUK), Helsinki, Finland)
Mr
Ashley Davies
(AWE Aldermaston, Reading, United Kingdom)
Mr
Matthew Goodwin
(AWE Aldermaston, Reading, United Kingdom)
