Die Anlagerung radioaktiver Atome an Aerosole (Schwebstoffe)

Lassen, L.; Rau, G.

doi:10.1007/bf01327856

Cited by 58 publications

(8 citation statements)

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“…Some radioactive elements such as Pb-210 (half-life, 21.4 years) seem to be useful for this study. Pb-210 in the atmosphere is a daughter of 3. Dyson (1956) and Lassen & Rau (1960), radioactive nuclides produced in the atmosphere, especially metallic elements having low vapor pressure, adhere to surrounding particles as soon rn they are born. These nuclides in aerosols, then, are transported by wind and removed chiefly by precipitation.…”

Section: Introductionmentioning

confidence: 99%

Pb-210 in precipitation in Japan and its implication for the transport of continental aerosols across the ocean

Fukuda

Tsunogai

1975

Tellus A: Dynamic Meteorology and Oceanography

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Total precipitation including rain or snow and dry fallout was collected once a month from February 1970 to March 1972 at five sampling stations in Hokkaido located from the coast of the Sea of Japan to inland. The monthly deposition rate of Pb-210 waa determined together with other chemical constituents. The results are summarized aa follows: (1) The deposition rate and the concentration of Pb-210 are remarkably high in winter.(2) A linear relation between the deposition rate of Pb-210 and the amount of rainfall is found in both summer and winter respectively. (3) As compared with the production rate of Pb-210, namely the exhalation rate of Rn-222 from the continent, the deposition rate of Pb-210 to the unit area at the coast of the Sea of Japan in winter is 2-4 times the exhalation rate of Rn-222 from the continent. (4) The budget calculation of Pb-210 in the atmosphere shows that about 40% of aerosols transported from the continent are caught by snow and deposited over the Sea of Japan and the Japan Islands in winter. Therefore, it is concluded that the Japan Islands play an important role as a collector of the continental aerosols in winter.Tellus XXVII (1975). 5

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Section: Introductionmentioning

confidence: 99%

Pb-210 in precipitation in Japan and its implication for the transport of continental aerosols across the ocean

Fukuda

Tsunogai

1975

Tellus A: Dynamic Meteorology and Oceanography

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“…The particular solution is found to be a linear combination of the No and In(,ulr) terms. Applying the boundary conditions as before, the solution to (17) can be shown to be:…”

Section: Mathematical Derivationmentioning

confidence: 99%

Steady State Solutions for the Diffusion Equations of Radon-222 Daughters

Wrenn¹,

Rosen²,

Pelt³

1969

Health Physics

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A mathematical model describing steady state diffusion of radon-222 daughters, based on a uniform distribution of radon has been deveIoped. Solutions are generated for four coupled, non-homogenous differential equations satisfying the boundary conditions that the concentrations of all daughters vanish at the walls for cylindrical geometry. The solutions of these equations give the concentration of RaA, RaB, RaC and RaD as a function of the distance from the center of the containing vessel in terms of the diffusion coeficient, the radioactive decay constants, and the dimensions of the containment vessel. The results, integrated over the volume of the container and expressed as a fraction of the radon concentration, yield parent-daughter equilibrium values for cylinders of various dimensions.When the cylindrical geometry is used to approximate a uranium mine tunnel with a diameter of 8 ft, the model indicates that a significant parent-daughter disequilibrium exists using a value of the diffusion constant characteristic of unattached ions or atoms. Under aon-static conditions, convective or turbulent mixing would further decrease the daughter concentrations relative to radon due to an increased concentration gradient at the wall; however, the presence of aerosols would tend to reduce the rate of diffusion to the walls.

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“…En 1949 , Bricard [27] déve loppe une théor ie originale sur la fixation des petits ions sur les aérosols . Son calcul est adap té, en 1960, par Lassen et Rau [28], à la fixation des ions radioactifs sur des particu les de dimens ions connues. Et c'est à partir des idées de Bricard que démarrent les prem iers travau x français sur l'aéro -sol radioactif atmosphérique naturel par l'auteur de cet article [29] x Poi n t s E x p è ri me n t a ux [47].…”

Section: Rayon CM 10 1r----+-----t-----\-f-4-1ễ; ; 10 'I-h'---t---t--unclassified

Histoire et découvertes de la radioactivité atmosphérique naturelle

Renoux¹

1996

Pollution Atmosphérique

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Die Anlagerung radioaktiver Atome an Aerosole (Schwebstoffe)

Cited by 58 publications

References 0 publications

Pb-210 in precipitation in Japan and its implication for the transport of continental aerosols across the ocean

Pb-210 in precipitation in Japan and its implication for the transport of continental aerosols across the ocean

Steady State Solutions for the Diffusion Equations of Radon-222 Daughters

Histoire et découvertes de la radioactivité atmosphérique naturelle

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