Vertical profile of tritium concentration in air during a chronic atmospheric HT release

Hiroshi Noguchi, Sumi Yokoyama

研究成果: Article査読

抄録

The vertical profiles of tritium gas and tritiated water concentrations in air, which would have an influence on the assessment of tritium doses as well as on the environmental monitoring of tritium, were measured in a chronic tritium gas release experiment performed in Canada in 1994. While both of the profiles were rather uniform during the day because of atmospheric mixing, large gradients of the profiles were observed at night. The gradient coefficients of the profiles were derived from the measurements. Correlations were analyzed between the gradient coefficients and meteorological conditions: solar radiation, wind speed, and turbulent diffusivity. It was found that the solar radiation was highly correlated with the gradient coefficients of tritium gas and tritiated water profiles and that the wind speed and turbulent diffusivity showed weaker correlations with those of tritiated water profiles. A one-dimensional tritium transport model was developed to analyze the vertical diffusion of tritiated water re-emitted from the ground into the atmosphere. The model consists of processes of tritium gas deposition to soil including oxidation into tritiated water, reemission of tritiated water, dilution of tritiated water in soil by rain, and vertical diffusion of tritiated water in the atmosphere. The model accurately represents the accumulation of tritiated water in soil water and the time variations and vertical profiles of tritiated water concentrations in air.

本文言語English
ページ(範囲)344-353
ページ数10
ジャーナルHealth Physics
84
3
DOI
出版ステータスPublished - 01-03-2003
外部発表はい

All Science Journal Classification (ASJC) codes

  • 疫学
  • 放射線学、核医学およびイメージング
  • 健康、毒物学および変異誘発

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