Posted on April 11, 2011 3:26 pm

iodine-131 in rainwater



Vancouver, Canada radiation tests show iodine-131 in
rainwater at almost 100 times above US drinking water limit April 8th, 2011 at
08:20 AM


Radiation from Japan reaches B.C. shores, Simon Fraser
University Media



… The jet stream is carrying the radiation from Japan to
North America.

Most of the radioactivity disperses in the atmosphere
and falls over the Pacific Ocean on its way over, but some of it has now reached
the west coast, falling down with rain, and mixing with seawater. It’s also
accumulating in seaweed.


The rainwater tested was collected at SFU’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 radioisotope’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 – 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


Read the press release here.


Rainwater tests results from Vancouver, CA:




Read the test results here.


11 Bq/L is equal to 297.3 picocuries per liter.
(Conversion calculator here)


The federal drinking water standard for Iodine-131 is 3
pCi/L. (Press



Agency for Toxic Substances and Disease Registry for
Iodine, CDC, April