That system you linked only measures radiation. While the sensor in Sweden actually sample the air to detect certain isotopes. STUK does have this type of senso

That system you linked only measures radiation. While the sensor in Sweden actually sample the air to detect certain isotopes. STUK does have this type of sensors also and did see these same type of isotopes in the air[1]. [1] Announcement in Finnish https://www.stuk.fi/-/helsingin-ilmassa-pienia-maaria-keinotekoisia-radioaktiivisia-aineita-viime-viikolla https://www.stuk.fi/-/helsingin-ilmassa-pienia-maaria-keinot...