Intercomparison of airborne tritium vapor sampling methods at Brookhaven National Laboratory

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Thesis. Submitted to Univ. of Tennessee, Knoxville. An intercomparison study was conducted on six tritium vapor samplers. Four of these were airflow samplers: a molecular sieve tube, a silica gel tube, a mixed silica gel tube (a column of clear silica gel mixed with 10% color-indicating silica gel), and two series-connected frit bubblers. The remaining two were non-airflow samplers: a thermoelectric cooler and an open petri dish containing clear silica gel mixed wiih 10% color-indicating silica gel. The analytical method associated with the mixed silica gel tube and the petri dish samplers incorporated a technique for direct counting of exposed ... continued below

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Pages: 66

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Marmaro, G.M. December 1, 1973.

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Thesis. Submitted to Univ. of Tennessee, Knoxville. An intercomparison study was conducted on six tritium vapor samplers. Four of these were airflow samplers: a molecular sieve tube, a silica gel tube, a mixed silica gel tube (a column of clear silica gel mixed with 10% color-indicating silica gel), and two series-connected frit bubblers. The remaining two were non-airflow samplers: a thermoelectric cooler and an open petri dish containing clear silica gel mixed wiih 10% color-indicating silica gel. The analytical method associated with the mixed silica gel tube and the petri dish samplers incorporated a technique for direct counting of exposed silica gel in a liquid scintillation spectrometer. The usual liquid scintillation technique was employed with all other analyses. An experimental system was devised whereby known concentrations of tritium vapor in air could be produced and which would permit simultaneous testing of the samplers. Air concentrations ranging from 7.51 x 10/sup -9/ mu Ci/cc to 1.30 x 10/sup -3/ mu Ci/cc were generated. The average response of most of the samplers generally indicated good accuracy, but the accompanying standard deviations demonstrated a lack of consisteney and reproduceability. The mean sampled-to-generated air concentration ratios, for all samplers except the silica gel tube, ranged from 0.83 to 1.07. while the associated standard deviations ranged from plus or minus 0.22 to plus or minus 0.48. Problems encountered during this study indicate that erroneous flowrtneter response can be a major source of error for airflow-type samplers. Results have shown that the direct counting technique is generally satisfa ctory. (auth)

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Pages: 66

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  • Other Information: Thesis. Submitted to Univ. of Tennessee, Knoxville. Orig. Receipt Date: 30-JUN-74

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  • Report No.: BNL--18505
  • Grant Number: None
  • DOI: 10.2172/4319511 | External Link
  • Office of Scientific & Technical Information Report Number: 4319511
  • Archival Resource Key: ark:/67531/metadc1021031

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • December 1, 1973

Added to The UNT Digital Library

  • Oct. 15, 2017, 10:09 p.m.

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  • Oct. 25, 2017, 10:17 p.m.

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Marmaro, G.M. Intercomparison of airborne tritium vapor sampling methods at Brookhaven National Laboratory, thesis or dissertation, December 1, 1973; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc1021031/: accessed December 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.