Gamma densitometer for measuring Pu density in fuel tubes Metadata

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  • Main Title Gamma densitometer for measuring Pu density in fuel tubes


  • Author: Winn, W.G.
    Creator Type: Personal


  • Name: Savannah River Plant (E.I. du Pont de Nemours & Company)
    Place of Publication: Aiken, South Carolina
    Additional Info: Du Pont de Nemours (E.I.) and Co., Aiken, SC (USA). Savannah River Lab.


  • Creation: 1982-01-01


  • English


  • Content Description: A fuel-gamma-densitometer (FGD) has been developed to examine nondestructively the uniformity of plutonium in aluminum-clad fuel tubes at the Savannah River Plant (SRP). The monitoring technique is ..gamma..-ray spectroscopy with a lead-collimated Ge(Li) detector. Plutonium density is correlated with the measured intensity of the 208 keV ..gamma..-ray from /sup 237/U (7d) of the /sup 241/Pu (15y) decay chain. The FGD measures the plutonium density within 0.125- or 0.25-inch-diameter areas of the 0.133- to 0.183-inch-thick tube walls. Each measurement yields a density ratio that relates the plutonium density of the measured area to the plutonium density in normal regions of the tube. The technique was used to appraise a series of fuel tubes to be irradated in an SRP reactor. High-density plutonium areas were initially identified by x-ray methods and then examined quantitatively with the FGD. The FGD reliably tested fuel tubes and yielded density ratios over a range of 0.0 to 2.5. FGD measurements examined (1) nonuniform plutonium densities or hot spots, (2) uniform high-density patches, and (3) plutonium density distribution in thin cladding regions. Measurements for tubes with known plutonium density agreed with predictions to within 2%. Attenuation measurements of the 208-keV ..gamma..-ray passage through the tube walls agreed to within 2 to 3% of calculated predictions. Collimator leakage measurements agreed with model calculations that predicted less than a 1.5% effect on plutonium density ratios. Finally, FGD measurements correlated well with x-ray transmission and fluoroscopic measurements. The data analysis for density ratios involved a small correction of about 10% for ..gamma..-shielding within the fuel tube. For hot spot examinations, limited information for this correction dictated a density ratio uncertainty of 3 to 5%.
  • Physical Description: Pages: 49


  • Keyword: Uranium Isotopes
  • Keyword: Actinide Compounds
  • Keyword: Attenuation
  • Keyword: Reactor Components
  • Keyword: Plutonium Isotopes
  • Keyword: Beta Decay Radioisotopes
  • Keyword: Spectrometers
  • Keyword: Testing
  • Keyword: Oxides
  • Keyword: Plutonium Compounds
  • Keyword: Us Doe
  • Keyword: Fuel Rods
  • Keyword: Beta-Minus Decay Radioisotopes
  • Keyword: Transuranium Compounds
  • STI Subject Categories: 21 Specific Nuclear Reactors And Associated Plants
  • Keyword: Isotopes
  • Keyword: Us Aec
  • Keyword: Chalcogenides
  • Keyword: Collimators
  • Keyword: Hot Spots
  • Keyword: Years Living Radioisotopes 440103* -- Radiation Instrumentation-- Nuclear Spectroscopic Instrumentation
  • Keyword: Plutonium Dioxide
  • STI Subject Categories: 220700 -- Nuclear Reactor Technology-- Plutonium & Isotope Production Reactors
  • Keyword: Materials Testing
  • Keyword: Measuring Instruments
  • Keyword: Plutonium 241
  • Keyword: Ge Semiconductor Detectors
  • Keyword: Us Organizations
  • Keyword: Production Reactors
  • Keyword: Nuclei
  • Keyword: Reactors
  • Keyword: Alpha Decay Radioisotopes
  • Keyword: Radiation Detectors
  • Keyword: Semiconductor Detectors
  • Keyword: Nuclear Medicine
  • Keyword: Nondestructive Testing
  • Keyword: Fuel Elements
  • Keyword: Densitometers
  • Keyword: Plutonium Oxides
  • Keyword: Actinide Isotopes
  • Keyword: Savannah River Plant
  • Keyword: Photon Transmission Scanning
  • Keyword: Gamma Spectrometers
  • Keyword: Li-Drifted Ge Detectors
  • Keyword: Fluoroscopy
  • Keyword: Oxygen Compounds
  • Keyword: Radiology
  • Keyword: National Organizations
  • Keyword: Photometers
  • STI Subject Categories: 46 Instrumentation Related To Nuclear Science And Technology
  • Keyword: Biomedical Radiography
  • Keyword: Days Living Radioisotopes
  • Keyword: Special Production Reactors
  • Keyword: Us Erda
  • Keyword: Performance Testing
  • Keyword: Radioisotopes
  • Keyword: Even-Odd Nuclei
  • Keyword: Leaks
  • Keyword: Diagnostic Techniques
  • Keyword: Heavy Nuclei
  • Keyword: Medicine
  • Keyword: Uranium 237
  • Keyword: Li-Drifted Detectors
  • Keyword: Actinide Nuclei
  • Keyword: Accuracy


  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI


  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Report


  • Text


  • Other: DE82014894
  • Report No.: DP-1599
  • Grant Number: AC09-76SR00001
  • DOI: 10.2172/5184141
  • Office of Scientific & Technical Information Report Number: 5184141
  • Archival Resource Key: ark:/67531/metadc1052933


  • Display Note: NTIS, PC A03/MF A01.