Patent Number: 
Section: claims

1. A method of controlling or containing radioactive contamination comprising:providing a neutron absorbing material comprising one or more of the lanthanide elements selected from the group consisting of gadolinium, samarium, europium, erbium and dysprosium in a portable dispenser;spraying said neutron absorbing material to a source of radioactive contamination from said portable dispenser;absorbing emitted neutrons of said radioactive contamination and controlling an expansion of said radioactive contamination;wherein said neutron absorbing material is mixed into cement or provided in an adhesive or provided in a high viscosity matrix. 2. The method of controlling or containing radioactive contamination according to claim 1 wherein said neutron absorbing material comprises a mixture further comprising at least one of hafnium, zirconium, tantalum, silver, indium, hydrogen, and mixtures thereof. 3. The method of controlling or containing radioactive contamination according to claim 1 wherein said neutron absorbing material is provided as one of a powder, a granule, a slurry, and a suspension.