Abstract
An air radioactivity monitoring study carried out in Dalat, Vietnam since 1986 has revealed distinct peaks of caesium isotope concentrations in air and fallout during December-January, when the monthly average air temperature was lowest and dry fallout dominated. These peaks provide evidence of the intrusion of more radioactive cold air masses from temperate northern latitudes during the development of large-scale anti cyclones, frequently observed in the most active winter monsoon period. High dry fallout velocity (about 10 cm/s) determined from the measured concentrations, clearly demonstrates one of the most relevant features of cold air masses: behind the cold front, vertical air motion is descending. The role of other processes, such as injection of radioactive air from stratosphere and local resuspension of soil dust, has been shown to be insignificant. The interpretation of the experimental results was based on the analysis of environmental -meteorological factors as well as the behaviour of other naturally-occurring radionuclides. (author). 7 refs, 2 figs.
Citation Formats
Hien, Pham Duy, Binh, Nguyen Thanh, Bac, Vuong Thu, Y, Truong, and Ngo, Nguyen Trong.
Long range transport of caesium isotopes from temperate latitudes to the equatorial zone during the winter monsoon period.
Viet Nam: N. p.,
1993.
Web.
Hien, Pham Duy, Binh, Nguyen Thanh, Bac, Vuong Thu, Y, Truong, & Ngo, Nguyen Trong.
Long range transport of caesium isotopes from temperate latitudes to the equatorial zone during the winter monsoon period.
Viet Nam.
Hien, Pham Duy, Binh, Nguyen Thanh, Bac, Vuong Thu, Y, Truong, and Ngo, Nguyen Trong.
1993.
"Long range transport of caesium isotopes from temperate latitudes to the equatorial zone during the winter monsoon period."
Viet Nam.
@misc{etde_10123189,
title = {Long range transport of caesium isotopes from temperate latitudes to the equatorial zone during the winter monsoon period}
author = {Hien, Pham Duy, Binh, Nguyen Thanh, Bac, Vuong Thu, Y, Truong, and Ngo, Nguyen Trong}
abstractNote = {An air radioactivity monitoring study carried out in Dalat, Vietnam since 1986 has revealed distinct peaks of caesium isotope concentrations in air and fallout during December-January, when the monthly average air temperature was lowest and dry fallout dominated. These peaks provide evidence of the intrusion of more radioactive cold air masses from temperate northern latitudes during the development of large-scale anti cyclones, frequently observed in the most active winter monsoon period. High dry fallout velocity (about 10 cm/s) determined from the measured concentrations, clearly demonstrates one of the most relevant features of cold air masses: behind the cold front, vertical air motion is descending. The role of other processes, such as injection of radioactive air from stratosphere and local resuspension of soil dust, has been shown to be insignificant. The interpretation of the experimental results was based on the analysis of environmental -meteorological factors as well as the behaviour of other naturally-occurring radionuclides. (author). 7 refs, 2 figs.}
place = {Viet Nam}
year = {1993}
month = {Dec}
}
title = {Long range transport of caesium isotopes from temperate latitudes to the equatorial zone during the winter monsoon period}
author = {Hien, Pham Duy, Binh, Nguyen Thanh, Bac, Vuong Thu, Y, Truong, and Ngo, Nguyen Trong}
abstractNote = {An air radioactivity monitoring study carried out in Dalat, Vietnam since 1986 has revealed distinct peaks of caesium isotope concentrations in air and fallout during December-January, when the monthly average air temperature was lowest and dry fallout dominated. These peaks provide evidence of the intrusion of more radioactive cold air masses from temperate northern latitudes during the development of large-scale anti cyclones, frequently observed in the most active winter monsoon period. High dry fallout velocity (about 10 cm/s) determined from the measured concentrations, clearly demonstrates one of the most relevant features of cold air masses: behind the cold front, vertical air motion is descending. The role of other processes, such as injection of radioactive air from stratosphere and local resuspension of soil dust, has been shown to be insignificant. The interpretation of the experimental results was based on the analysis of environmental -meteorological factors as well as the behaviour of other naturally-occurring radionuclides. (author). 7 refs, 2 figs.}
place = {Viet Nam}
year = {1993}
month = {Dec}
}