Monitoring and modeling for radon entry into basements: A status report for the small structures project

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The approach, status, and initial findings of a research project on radon transport through soil and entry into buildings are described. We have constructed two room-size precisely-fabricated basements at a site with relatively homogeneous soil. The structures have adjustable-size openings to the soil, are otherwise very air-tight, and are mechanically ventilated using a system that also controls the indoor-outdoor pressure difference. Numerous probes have been installed in the soil surrounding the structures to permit multipoint measurement of soil moisture content, soil temperature, permeability of soil to air, soil-gas pressure and radon concentration. State-of-the-art instrumentation is being installed for real-time monitoring ... continued below

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Pages: (59 p)

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Fisk, W.J.; Flexser, S.; Gadgil, A.J.; Holman, H.Y.; Modera, M.P.; Narasimhan, T.N. et al. September 1, 1989.

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The approach, status, and initial findings of a research project on radon transport through soil and entry into buildings are described. We have constructed two room-size precisely-fabricated basements at a site with relatively homogeneous soil. The structures have adjustable-size openings to the soil, are otherwise very air-tight, and are mechanically ventilated using a system that also controls the indoor-outdoor pressure difference. Numerous probes have been installed in the soil surrounding the structures to permit multipoint measurement of soil moisture content, soil temperature, permeability of soil to air, soil-gas pressure and radon concentration. State-of-the-art instrumentation is being installed for real-time monitoring of these parameters plus structure ventilation rate, indoor and entering soil-gas radon concentrations, and meteorologic parameters for a period of at least one year. Many of the factors that control or influence radon entry will be modified intentionally or by changes in environmental parameters during the course of the measurements. We have found it necessary to design and fabricate a new type of probe for more accurate measurements of soil permeability. We have also verified and improved procedures for more accurate, rapid, multipoint measurements of radon concentrations using a continuous radon monitor. Identical structures, with the same instrumentation, will be constructed at additional sites with difference soil characteristics and climates. Core samples of the soil from each site are analyzed to determine density, porosity, permeability, radium content, and radon emmanation coefficient. The research project also includes steady-state and transient numerical modeling efforts that complement the experimental research and that will use the experimental data for model validation. 32 refs., 12 figs., 5 tabs.

Physical Description

Pages: (59 p)

Notes

NTIS, PC A04/MF A01 - OSTI; GPO Dep.

Source

  • Radon contractors conference, Fort Collins, CO (USA), 20-22 Sep 1989

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  • Other: DE90002456
  • Report No.: LBL-27692
  • Report No.: CONF-8909250--1
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 5653444
  • Archival Resource Key: ark:/67531/metadc1084521

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  • September 1, 1989

Added to The UNT Digital Library

  • Feb. 10, 2018, 10:06 p.m.

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  • April 25, 2018, 5:38 p.m.

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Fisk, W.J.; Flexser, S.; Gadgil, A.J.; Holman, H.Y.; Modera, M.P.; Narasimhan, T.N. et al. Monitoring and modeling for radon entry into basements: A status report for the small structures project, article, September 1, 1989; [Berkeley,] California. (digital.library.unt.edu/ark:/67531/metadc1084521/: accessed November 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.