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The absorber KNiFC-PAN, potassium-nickel hexacyanoferrate (II) (KNiFC) bound into modified polyacrylonitrile (PAN) is capable of absorbing radiocesium with up to 99 % recovery. KNiFC-PAN was used to collect cesium during several cruises near Fukushima, Japan, and the U.S. and Canadian west coasts by passing seawater through 5 ml of KNiFC absorber followed by counting on a germanium well detector. Other applications of this resin include in situ collection via the use of the Clio SUPR sampler during a cruise in the Marshall Islands, and development of a wearable device containing the resin. [ABSTRACT FROM AUTHOR]