Thoron (Rn-2 20) measurements in the atmosphere and their application in meteorology

Israël, G.W.

doi:10.3402/tellusa.v17i3.9062

Cited by 16 publications

(12 citation statements)

References 5 publications

(4 reference statements)

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“…Plant transpiration produces radon and thoron gases (Allen et al, 1964), which in turn produce ion pair production. Therefore, the air ion curve of both the polarities increases from early morning and reaches maximum at noon rather than night (Israel, 1965;Israel et al, 1969). Positive ions can be produced by various kinds of friction: between air masses, between air and sand or dirt particles swept up by the wind, and between weather fronts that march endlessly across the globe.…”

Section: Resultsmentioning

confidence: 99%

Diurnal and Seasonal Air Ion Variability at Rural Station Ramanandnagar (17°2'N, 74°E), India

Pawar¹,

Meena

Jadhav

2010

Aerosol Air Qual. Res.

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Section: Resultsmentioning

confidence: 99%

Diurnal and Seasonal Air Ion Variability at Rural Station Ramanandnagar (17°2'N, 74°E), India

Pawar¹,

Meena

Jadhav

2010

Aerosol Air Qual. Res.

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“…0.055 Bq m -3 (range 0.028-0.19 Bq m -3 ), from 157 random atmospheric samples in Germany. In early studies the dependence of 212 Pb concentration on wind direction and its application to meteorology was investigated at some locations in Germany [11,12]. As mentioned above, however, there is a lack of information on the variation of thoron progeny concentrations with time on a long-term scale.…”

Section: Introductionmentioning

confidence: 99%

Temporal variation of thoron decay product concentration in the atmosphere and comparison with radon decay product concentration

Winkler¹,

Aehlig²

1998

Radiation and Environmental Biophysics

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Seasonal and long-term variation of the airborne 212Pb concentration, representative of the equilibrium equivalent concentration of thoron decay products (EECRn220), was investigated from 1989 through 1996 at a semi-natural location in southern Germany. Continuous measurement yielded a long-term average concentration of 0.082 Bq m-3, while daily mean concentrations varied from < or = 0.01 to 0.34 Bq m-3. An average annual effective dose of 1.4 mSv due to outdoor thoron progeny concentration was estimated. This is about 2% of the dose due to the average short-lived radon progeny concentration (EECRn222) of 8.4 Bq m-3 measured for this location in the same period. In most years the seasonal pattern of 212Pb activity concentration in the atmosphere is characterized by two maxima: the first in May and the second one in September. Low concentrations are observed from November through February of each year. This is in contrast to the behaviour of the short-lived 222Rn progeny which exhibit enhanced concentrations exactly during these months. The most probable reason for the different temporal behaviour of 212Pb is the extremely reduced flux of thoron gas from the ground during the winter months.

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“…3(a)). Air ion count curve of both polarities increases from early morning and reaches to maximum at noon time rather than night (Israël, 1965(Israël, , 1969. At the rural site Ramanandnagar the area is surrounded by crops like sugarcane; corn etc.…”

Section: Air Ion Variation At Different Atmospheric Stationsmentioning

confidence: 99%

Air Ion Variation at Poultry-farm, Coastal, Mountain, Rural and Urban Sites in India

Pawar¹,

Meena

Jadhav

2012

Aerosol Air Qual. Res.

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The air ions are continuously generated and destroyed by various processes in the atmosphere. Near the surface, the nature of ions is very complex and they show large variations in their physical properties. The attachment of small ions to the aerosol particles is depending on the mobility of air ions. High mobility air ions immediately are attached to the aerosol particles and settle down on the surface. In this study we report, about the air ion variation at different sites like Rural, Coastal, Mountain, Poultry farm and urban in the state of Maharashtra in India. The aim of this study is to understand the plausible distribution of air ions both diurnally and at different times in a day for long time (three years) and with various meteorological variables. The preliminary analysis of the data has reveled that negative air ions are observed to have attached to the aerosol particles and large aerosol particles are formed from small aerosol particles. Therefore uni-polarity factor observed to be below unity for coastal, mountain and rural site and about 2.8 at an urban site. However worst case is observed at the Poultry farm, where uni-polarity factor is 6.3, which is very harmful for human health. There is also effect of meteorological parameters on air ion concentration in the atmosphere.

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Thoron (Rn-2 20) measurements in the atmosphere and their application in meteorology

Cited by 16 publications

References 5 publications

Diurnal and Seasonal Air Ion Variability at Rural Station Ramanandnagar (17°2'N, 74°E), India

Diurnal and Seasonal Air Ion Variability at Rural Station Ramanandnagar (17°2'N, 74°E), India

Temporal variation of thoron decay product concentration in the atmosphere and comparison with radon decay product concentration

Air Ion Variation at Poultry-farm, Coastal, Mountain, Rural and Urban Sites in India

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