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Title: Influence of air flow on the behavior of thoron and its progeny in a traditional Japanese house

Abstract

Air flow influence on the spatial distribution of thoron ({sup 220}Rn) concentration in a typical Japanese traditional house was investigated at various indoor air flow levels. The effect of air flow on the behavior of both thoron and radon progeny were examined simultaneously. Measurements were carried out by using two types of passive monitors, the radon-thoron discriminative monitor and the Radtrak monitor. Thoron and radon progeny were measured by filter grab sampling with ZnS scintillation counting. Under static condition, a horizontal distribution with greatly varied thoron concentrations was found as reported by previous studies. Under turbulent conditions, thoron concentrations in the middle of the room increased and the concentration gradient of thoron gas became lower. An obvious vertical distribution of thoron was also observed. Prominent diurnal variation of radon progeny concentrations was observed whereas that of thoron progeny concentrations was not. Concentration of thoron progeny changed little at different air flow levels, although the thoron gas level at the middle of the room varied significantly. The influence of air flows on detection efficiencies of the two types of thoron monitors were also checked. The mechanism of behavioral change of thoron and its progeny in turbulent atmosphere is discussed. 18 refs.,more » 7 figs.« less

Authors:
 [1]; ;  [2]
  1. Shiga Univ. of Medical Science, Otsu, Shiga (Japan)
  2. National Institute of Radiological Sciences, Inage-ku, Chiba (Japan); and others
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
433049
Resource Type:
Journal Article
Journal Name:
Health Physics
Additional Journal Information:
Journal Volume: 72; Journal Issue: 1; Other Information: PBD: Jan 1997
Country of Publication:
United States
Language:
English
Subject:
56 BIOLOGY AND MEDICINE, APPLIED STUDIES; RADON 220; RADIATION MONITORING; AIR FLOW; PROGENY; RADON; SPATIAL DISTRIBUTION; SCINTILLATION COUNTING; HOUSES; AIR; INHALATION

Citation Formats

Ma, Jizeng, Doi, Masahiro, and Kobayashi, Sadayoshi. Influence of air flow on the behavior of thoron and its progeny in a traditional Japanese house. United States: N. p., 1997. Web. doi:10.1097/00004032-199701000-00011.
Ma, Jizeng, Doi, Masahiro, & Kobayashi, Sadayoshi. Influence of air flow on the behavior of thoron and its progeny in a traditional Japanese house. United States. https://doi.org/10.1097/00004032-199701000-00011
Ma, Jizeng, Doi, Masahiro, and Kobayashi, Sadayoshi. Wed . "Influence of air flow on the behavior of thoron and its progeny in a traditional Japanese house". United States. https://doi.org/10.1097/00004032-199701000-00011.
@article{osti_433049,
title = {Influence of air flow on the behavior of thoron and its progeny in a traditional Japanese house},
author = {Ma, Jizeng and Doi, Masahiro and Kobayashi, Sadayoshi},
abstractNote = {Air flow influence on the spatial distribution of thoron ({sup 220}Rn) concentration in a typical Japanese traditional house was investigated at various indoor air flow levels. The effect of air flow on the behavior of both thoron and radon progeny were examined simultaneously. Measurements were carried out by using two types of passive monitors, the radon-thoron discriminative monitor and the Radtrak monitor. Thoron and radon progeny were measured by filter grab sampling with ZnS scintillation counting. Under static condition, a horizontal distribution with greatly varied thoron concentrations was found as reported by previous studies. Under turbulent conditions, thoron concentrations in the middle of the room increased and the concentration gradient of thoron gas became lower. An obvious vertical distribution of thoron was also observed. Prominent diurnal variation of radon progeny concentrations was observed whereas that of thoron progeny concentrations was not. Concentration of thoron progeny changed little at different air flow levels, although the thoron gas level at the middle of the room varied significantly. The influence of air flows on detection efficiencies of the two types of thoron monitors were also checked. The mechanism of behavioral change of thoron and its progeny in turbulent atmosphere is discussed. 18 refs., 7 figs.},
doi = {10.1097/00004032-199701000-00011},
url = {https://www.osti.gov/biblio/433049}, journal = {Health Physics},
number = 1,
volume = 72,
place = {United States},
year = {1997},
month = {1}
}