Radionuclide release to stagnant water in the Fukushima-1 nuclear power plant¹

Spatial variations of tritium concentrations in groundwater collected in the southern coastal region of Fukushima, Japan, after the nuclear accident

“…In the accident, tritium was released from the reactors damaged by the fuel meltdown and venting operation 17 . A tritium inventory on 11 March 2011 for the F1NPS reactor units 1, 2, and 3 were estimated to be in a total of 3.4 × 10 15 Bq 18 . A portion of the tritium was considered to have been released to the atmosphere as tritiated water vapour and scavenged from the atmosphere as precipitation 8 .…”

Concentrations of 90Sr and 137Cs/90Sr activity ratios in marine fishes after the Fukushima Dai‐ichi Nuclear Power Plant accident

“…Two kinds of radioactive strontium (Sr)-89 (physical half-life; 50.5 days) and 90 Sr (28.8 years) were released from the FNPP, whereas other major released radioactive materials were radioactive iodine-131 (8.02 days), and radioactive cesium (Cs)-134 (2.06 years) and 137 Cs (30.1 years). The activity ratio of the 89 Sr/ 90 Sr ratio from the reactor core inventory on 11 March 2011 was estimated to be 11.5 (Nishihara et al, 2012;Povinec et al, 2012), although the amount of the two kinds of radioactive Cs was assumed to be approximately equal to each other (Chino et al, 2011).…”

Porous 3D Prussian blue/cellulose aerogel as a decorporation agent for removal of ingested cesium from the gastrointestinal tract

“…In order to study adsorption kinetics, non-radioactive Cs concentrations (0.1, 1, and 5 ppm) were determined by the stagnant water Cs concentration. The maximum 137 Cs concentration in the Fukushima-1 nuclear power plant is 3.0 × 10 6 Bq/mL (3.0 × 10 9 Bq/L) 65 . As 1 g of 137 Cs has an activity of 88 Ci/g (3.26 × 10 9 Bq/mg) 66 , the Cs concentration was calculated as follows: …”