Patent Number: 054769892
Section: claims

1. An adsorbent useful for the adsorption of radioactive nuclides comprising fibrous active carbon having a specific surface area of 1,000 m.sup.2 /g or more, having an equilibrium moisture regain of 10% or more at a relative humidity of 45% and including hydrophilic functional groups. 2. The adsorbent according to claim 1, wherein said fibrous active carbon has a specific surface area of from 1,500 to 2,500 m.sup.2 /g. 3. The adsorbent according to claim 1, wherein said fibrous active carbon has an equilibrium moisture regain of 15% or more at a relative humidity of 45%. 4. The adsorbent according to claim 2, wherein said fibrous active carbon has an equilibrium moisture regain of 15% or more at a relative humidity of 45%. 5. A process for volume-reduction treatment of radioactive liquid waste which comprises subjecting radioactive liquid waste containing radioactive nuclides to an adsorption treatment using an adsorbent comprising fibrous active carbon having a specific surface area of 1,000 m.sup.2 /g or more, and subsequently  subjecting the spent adsorbent to an incineration treatment at a temperature which is equal to or higher than the ignition point of said fibrous active carbon. 6. The process according to claim 5, wherein said incineration treatment is effected at a temperature which is equal to or higher than the ignition point of said fibrous active carbon but not exceeding a temperature of 600.degree. C. above the ignition point. 7. The process according to claim 5 wherein said adsorbent is the adsorbent of claim 1.