The rainwater tested was collected at SFUâ€™s campus on Burnaby Mountain and in downtown Vancouver, while seaweed samples were collected in North Vancouver near the Seabus terminal. Researchers began monitoring rainwater earlier this month but did not see the signature for iodine-131 in samples taken March 16 and March 18. However, they did detect the radioisotopeâ€™s signature in samples from March 19, 20 and 25.
Here are the results from the tests (measured in decays of iodine-131 per second per litre of rainwater â€“ Bq/l):
* March 18: 0 (2) Bq/l
* March 19: 9 (2) Bq/l
* March 20: 12 (2) Bq/l
* March 25: 11 (2) Bq/l