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Title: Indirect measurement sub floor radon using passive detectors

Indirect measurement sub floor radon using passive detectors Hourly {sup 222}Rn measurements have been made in an 80-y-old wood frame house for about 6 y. The average {sup 222}Rn concentration in the basement is 40 Bq m{sup -3}. Two holes were drilled in the slab and standard 150 cfm fans installed via a short length of PVC pipe. The air from beneath the slab was blown directly into the basement to indirectly study the long term variability in the subslab gas concentration. Passive CR-39 {sup 222}Rn alpha track detectors of our design were placed weekly in the fan exit air to estimate the average subslab gas concentration. Instantaneous subslab gas {sup 222}Rn concentration was measured directly using scintillation flasks filled from adjacent floor ports once per week. The agreement with the indirect measurements was good. The average weekly basement {sup 222}Rn concentration correlated well with the weekly integrated soil gas {sup 222}Rn concentration. An increase from 44 to 74 Bq m{sup -3} in basement air corresponded to an increase of 1.8 to 3.7 MBq m{sup -3} in subslab soil gas. An increase in weekly average temperature from 10{degrees} to 30{degrees}C increased the integrated soil gas concentration from 1.8 to 3.7 MBq m{sup -3}, and an increase in average more » wind speed from calm to 0.5 in s{sup -1} decreased the subslab concentration from 3.7 to 1.8 MBq m{sup -3}. « less
Authors: ;
Publication Date:
OSTI Identifier:OSTI ID: 394057
Report Number(s):CONF-9607135--
Journal ID: HLTPAO; ISSN 0017-9078; TRN: 96:028735
DOE Contract Number:FG02-87ER60547
Resource Type:Journal Article
Resource Relation:Journal Name: Health Physics; Journal Volume: 70; Journal Issue: Suppl.6; Conference: 41. Annual Meeting of the Health Physics Society, Seattle, WA (United States), 21-25 Jul 1996; Other Information: PBD: Jun 1996
Country of Publication:United States
Language:English
Subject: 44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; 56 BIOLOGY AND MEDICINE, APPLIED STUDIES; SOILS; RADIATION MONITORING; WIND; CORRELATIONS; TEMPERATURE DEPENDENCE; HOUSES; RADON 222; BASEMENTS; RADIATION DETECTORS