Status of the WAND (Waste Assay for Nonradioactive Disposal) project as of July 1997

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The WAND (Waste Assay for Nonradioactive Disposal) system can scan thought-to-be-clean, low-density waste (mostly paper and plastics) to determine whether the levels of any contaminant radioactivity are low enough to justify their disposal in normal public landfills or similar facilities. Such a screening would allow probably at least half of the large volume of low-density waste now buried at high cost in LANL`s Rad Waste Landfill (Area G at Technical Area 54) to be disposed of elsewhere at a much lower cost. The WAND System consists of a well-shielded bank of six 5-in.-diam. phoswich scintillation detectors; a mechanical conveyor system ... continued below

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25 p.

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Arnone, G. J.; Foster, L. A.; Foxx, C. L.; Hagan, R. C.; Martin, E. R.; Myers, S. C. et al. March 1998.

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Description

The WAND (Waste Assay for Nonradioactive Disposal) system can scan thought-to-be-clean, low-density waste (mostly paper and plastics) to determine whether the levels of any contaminant radioactivity are low enough to justify their disposal in normal public landfills or similar facilities. Such a screening would allow probably at least half of the large volume of low-density waste now buried at high cost in LANL`s Rad Waste Landfill (Area G at Technical Area 54) to be disposed of elsewhere at a much lower cost. The WAND System consists of a well-shielded bank of six 5-in.-diam. phoswich scintillation detectors; a mechanical conveyor system that carries a 12-in.-wide layer of either shredded material or packets of paper sheets beneath the bank of detectors; the electronics needed to process the outputs of the detectors; and a small computer to control the whole system and to perform the data analysis. WAND system minimum detectable activities (MDAs) for point sources range from {approximately}20 dps for {sup 241}Am to approximately 10 times that value for {sup 239}Pu, with most other nuclides of interest being between those values, depending upon the emission probabilities of the radiations emitted (usually gamma rays and/or x-rays). The system can also detect beta particles that have energies {ge}100 keV, but it is not easy to define an MDA based on beta radiation detection because of the greater absorption of beta particles relative to photons in low Z-materials. The only radioactive nuclides not detectable by the WAND system are pure alpha emitters and very-low-energy beta emitters. At this time, operating procedures and quality assurance procedures are in place and training materials are available to operators. The system is ready to perform useful work; however, it would be both possible and desirable to upgrade the electronic components and the analysis algorithms.

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25 p.

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INIS; OSTI as DE98006020

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  • Other Information: PBD: Mar 1998

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  • Other: DE98006020
  • Report No.: LA--13432-SR
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/656520 | External Link
  • Office of Scientific & Technical Information Report Number: 656520
  • Archival Resource Key: ark:/67531/metadc703001

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  • March 1998

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  • Sept. 12, 2015, 6:31 a.m.

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  • May 20, 2016, 1:53 p.m.

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Arnone, G. J.; Foster, L. A.; Foxx, C. L.; Hagan, R. C.; Martin, E. R.; Myers, S. C. et al. Status of the WAND (Waste Assay for Nonradioactive Disposal) project as of July 1997, report, March 1998; New Mexico. (digital.library.unt.edu/ark:/67531/metadc703001/: accessed October 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.