Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Output queued switch with a parallel shared memory, and method of operating same
Systems and methods for synchronizing and controlling multiple image sensors
ESD protection device and method for producing the same
Methods of diagnosing a plasmodium infection
Satellite fleet deployment
Integrated circuit package system with bonding lands
Reconstruction of deforming surfaces by canceling ambient occlusion and refining 3-D shape
  Randomly Featured Patents
Sun visor for motor vehicles
Color stable iron and zinc fortified compositions
Methods and compositions for the inhibition of meristematic growth on cucurbit rootstock
Cover for a transport temperature control unit
Mechanism for parallel connection of infinitely-adjustable looping gearings
Non-halogenous insulated wire and a wiring harness
Method and apparatus for digital audio transmission
Optical detection of alignment and/or absence of tape cartridge leader pin
Polyimide molded tool for gripping hot glassware
Detection of defects in a circular or spiral diffraction grating