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
Methods of forming semiconductor devices having faceted semiconductor patterns
Driving control apparatus and method for use with a display array
Display screen or portion thereof with graphical user interface
Difference amplifier arrangement with transconductance amplifier based current compensation
Viterbi decoder method and apparatus with RI detector in servo channel
System and method for use of fractional pay-up ticks in relation to trading strategies in an electronic trading environment
Asymmetric dielectric elastomer composite material
  Randomly Featured Patents
Wet press with vibration control
Web based tool control in a semiconductor fabrication facility
Apparatus for cooling daughter boards
Method for producing a pressure-sensitive adhesive tape or sheet
DC-DC boost converter circuit with an output stabilization circuit and method for driving the same
Switching arrangement for a reversible ratchet type wrench
Information processing apparatus
Portable outdoor bumper pool table
Devices, methods, and computer-readable media for providing broad quality of service optimization using policy-based selective quality degradation
Inductive rotary joint comprising polymer material