The authors engaged in multi-sited ethnographic fieldwork that took place in and around Fukushima but also in other geografical sites like Tochigi, Miyagi, Aichi, Tokyo and Kyoto. There, they conduct semi-structured interviews with various organisations that are all somehow involved with citizen science or radiation measurement. To learn about the citizens that measure radioactivity and create their own data on radiation because of a lack of provided data by the government, a literature review of policy documents and workshops with those citizen scientists is performed.