At five Gävle sampling sites in 2020, median caesium-137 values in monitored trattkantarell ranged from 116 to 1,100 Bq/kg fresh weight. That spread is the reason a fallout map is context, not an answer for a specimen.
Finland has tracked its berry crop since the 1990s. Sweden ran a forecast for twelve seasons, then the funding went and nothing replaced it. What was lost, and what it took to build.
Sweden has millions of species observations and almost none of them record where somebody looked and found nothing. That absence shapes what any model can honestly claim.