Affiliation:
1. National Institute of Radiological Sciences, National Institutes for Quantum Science and Technology , 4-9-1 Anagawa, Inage-ku, Chiba 263-8555 , Japan
Abstract
Abstract
More than 10 y have passed since the Fukushima Dai-ichi Nuclear Power Plant (F1-NPP) accident, but there are still many areas with high levels of radioactive contamination, especially reservoirs and lakes, where the levels decrease slowly. The exposed dose to non-human biota is of great concern. In this work, the exposure dose to wild medaka (small aquarium fish) around F1-NPP was measured/estimated by two approaches: in situ measurement and with the ERICA assessment tool. S2 is a reservoir located 7.5 km from F1-NPP, and the ambient dose rate was 25.0 μSv per h in 2012, but decreased to 4.82 μSv per h in 2021. The external exposure dose rate to wild medaka living there was 0.8–11.8 μGy per h (2017–21) by in situ measurement, and the estimated dose rate with the ERICA assessment tool was 0.6–54.5 μGy per h (2012–21). The estimated and measured doses to wild medaka are not expected to cause any significant radiation effects.
Funder
Japan Society for the Promotion of Science
Publisher
Oxford University Press (OUP)
Subject
Public Health, Environmental and Occupational Health,Radiology, Nuclear Medicine and imaging,General Medicine,Radiation,Radiological and Ultrasound Technology