Health Canada website’s highest concentration of xenon-133 (Xe-133) detected at a Canadian CTBTO monitoring station after Fukushima disaster (SOURCE):
- Ottawa, Ontario on March 31, 2011: 3.64 Bq/m3
- St. Johns, Newfoundland and Labrador on April 4, 2011: 3.51 Bq/m3
Health Canada’s radiation monitoring network highest concentration of Xe-133 (SOURCE):
- Victoria, British Columbia on March 20, 2011: 230 Bq/m3 (approximated, as exact figure not stated on chart)
- Sydney, British Columbia on March 20, 2011: 205 Bq/m3 (approximated, as exact figure not stated on chart)
Also note Health Canada’s website shows that Xe-133 was never detected after Fukushima at the Sydney, BC monitoring station (SOURCE).