Resources Contact Us Home
Method and apparatus for measuring reactivity of fissile material

Image Number 5 for United States Patent #4493810.

Given are a method and apparatus for measuring nondestructively and non-invasively (i.e., using no internal probing) the burnup, reactivity, or fissile content of any material which emits neutrons and which has fissionable components. No external neutron-emitting interrogation source or fissile material is used and no scanning is required, although if a profile is desired scanning can be used. As in active assays, here both reactivity and content of fissionable material can be measured. The assay is accomplished by altering the return flux of neutrons into the fuel assembly. The return flux is altered by changing the reflecting material. The existing passive neutron emissions in the material being assayed are used as the source of interrogating neutrons. Two measurements of either emitted neutron or emitted gamma-ray count rates are made and are then correlated to either reactivity, burnup, or fissionable content of the material being assayed, thus providing a measurement of either reactivity, burnup, or fissionable content of the material being assayed. Spent fuel which has been freshly discharged from a reactor can be assayed using this method and apparatus. Precisions of 1000 MWd/tU appear to be feasible.

  Recently Added Patents
Vehicle motion control device
Owner-brokered knowledge sharing machine
Probe for ultrasound diagnostic apparatus
Packaging for socks
Administrable compositions
Millimeter wave imaging method and system to detect concealed objects
  Randomly Featured Patents
Methods and apparatus for managing a set of cables
Programmable hold delay
Pipe clamp with improved fastener
Data imprinting device for a camera
Fountain pottery
Process for producing gold films
Programmable memory controller
Method of self-assembling electronic circuitry and circuits formed thereby
Method and apparatus for electrically balancing three-phase arc discharge furnaces
Mobile phone