Didn’t Chernobyl poison the lichens across northern Scandinavia and cause the reindeer farmers to cull their herds?
However, a lot of that sinks into the soil, or was discovered to not present a long term threat. I believe the Russians are still prohibiting the consumption of Reindeer but folks in Western Scandinavia seem to be recovering.
One of the Sa'ami problems is they've lived with an exceedingly high iron content background for tens of thousands of years ~ and their game animals have had a high iron content. Some of the Sa'ami may well have spent the Younger Dryas on the Norwegian Coast eating little but seals.
They seem to have a NEED for a very high iron content in their food ~ way beyond what can be provided through ordinary means.
With the reindeer meat shortage, they probably ought to be provisioned with that canned Harp Seal meat the Canadians are putting out. Unfortunately the EU, which has a lot of people always into genocide, prohibits the importation of seal meat.