Determination of Radiocaesium Concentration in Irrigation Water Using Sorbent Disk

Abstract

We developed a method for easily and rapidly determining the concentration of ¹³⁷Cs in irrigation water for paddy fields by a germanium detector. A Caesium Rad Disk Pack and a Rad Disk sampler were used to separate radiocaesium by a particle size and to concentrate radiocaesium on a Caesium Rad Disk and a pre-filter. Concentration of ¹³⁷Cs in irrigation water was determined at a detection limit of 0.2Bq kg⁻¹ with a detection time of 4000 seconds.