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
Authentication service
Compression molding method and reinforced thermoplastic parts molded thereby
Enhanced telephony services
Packet transmission method, apparatus, and network system
Loudspeaker grille
Memory management configuration
Electronic device, display, image processing apparatus and electronic calculating apparatus
  Randomly Featured Patents
Process for the separation of actinides from lanthanides by the selective extraction of the actinides in an organic solvent incorporating a propane diamide
Method for conversion mode selection in hangeul to hanja character conversion
Personal watercraft canopy
Marking document and template assembly and method of making the assembly
Image forming apparatus
Fluid apparatus such as a pump or an accumulator
Concentrating collector lens assembly
Memory card connector with hinged cover
Anti-tumor activity of Ea-4-peptide of pro-IGF-1
Distributed computer architecture and process for virtual copying