The first notification was from our supplier, GE Healthcare, which supplies our isotopes locally at the Brantford General Hospital. They had advised us that there would be a short-term disruption in the supply of isotopes. They did not know how long it would take, and we were advised that we should start to adjust patient bookings accordingly at that point.
This is not unusual. When there is a problem with production of a radioactive isotope, we do get notification saying it won't be available, it's in customs, etc. So that first notice did not raise a lot of alarm bells for us.
We started to get very concerned on the Friday, and significantly on the following Monday, which would have been around December 1, in that range. That's how we found out.