Hot spin?

Yesterday Hot Shit Minister for Natural Resources Lisa "I bathe in Evian" Raitt told the opposition in the House of Commons that the CNSC had assured her that the radiation was linked to medical isotopes and had nothing to do with a Dec. 5 leak at the Chalk River nuclear plant 185 kilometres northwest of Ottawa. That nuclear facility is located upstream of the Ottawa River.

From the CBC:

The sludge that was recently quarantined near the Canadian border tested positive for radiation because of the presence of a medical isotope, according to the Canadian Nuclear Safety Commission. ...

Since then, the sludge has been stored at Third High Farms, a waste storage facility in Iroquois, Ont., and consultants have been called in to investigate. The culprit appears to be the isotope iodine 131. The CNSC has said the isotope, which is used for medical procedures, is most likely the source of the radiation detected in the sludge.

More information here.

Still, nowhere does it say if truckloads of biosolids have been refused entry to the US previously, because of radioactive levels. Presumably, iodine 131 has been flushed consistently into the sewage system for decades now. What caused the recent spike?