Advertisement

Water, Air, and Soil Pollution

, Volume 158, Issue 1, pp 181–192 | Cite as

Estimation of Deposition Velocities for 85Sr, 131I, 137Cs on Spinach, Radish and Beans Leaves in a Tropical Region Under Simulated Fallout Conditions

  • R. K. SinghalEmail author
  • U. Narayanan
  • R. P. Gurg
Article

Abstract

Poly dispersive aerosols of SrCl2, NaI, CsCl having a size distribution of 2.33 μm (Activity Median Aerodynamic Diameter, [AMAD]) with a geometric standard deviation of 1.83 μm are used for the determination of deposition velocity for 85Sr, 131I and 137Cs aerosols on tropical spinach (Spinicia olericia), radish (Raphanous sative) and beans (Phasolous valugeries) plant leaves. The experiments were carried out in a specially designed exposure chamber to simulate deposition under accidental releases of radioactivity in tropical environment. The rates of particles deposition are expressed as a function of plant surface area and of plant dry weight. The deposition velocities obtained are in the range of 10−6 to 10−7 m/s. These values differ significantly from those in temperate regions. The lower values for deposition velocities (vg) for the tropical environment is attributed due to high humidity. Therefore, the deposition of suspended aerosols on leaf surfaces caused by impaction and Brownian diffusion becomes slower in tropical environment and resulted into lower value of deposition velocities.

aerosols beans 137Cs deposition velocity 131radish spinach 85Sr tropical environment 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Chadwick, R.C. and Chamberlain, A.C.: 1970, 'Field Loss of Radionuclides from Grass', Atmos. Environ. 4, 51–56.Google Scholar
  2. Chamberlain, A.C.: 1970, 'Interception and Retention of Radioactive Aerosols by Vegetation', Atmos. Environ. 4, 57–78.Google Scholar
  3. Charles, M.W.: 1980, 'An Analysis of Measured Values for the Fraction of a Radioactive Aerosols Intercepted by Vegetation', Health Phys. 38, 705–712.Google Scholar
  4. Hungate, F.P., Cline, J.F., Ulher, R.L. and Selders, A.A.: 1963, 'Foliar Sorption of 131 I byPlants', Health Phys. 9, 1159–1166.Google Scholar
  5. JAEA (International Atomic Energy Agency):1982, Generic Model and Parameters for Assessing the Environmental Transfer of Radionuclides from Routine Releases,Vienna safety series no 57, pp.Google Scholar
  6. Little, P.: 1977, 'Deposition of 2.75, 5.0 and 8.5 µm Particles to Plant and Soil Surface', Environ. Poll. 12, 293–304.Google Scholar
  7. Raghunath, B., Soni, P.S., Samuel, A.M. and Iyer, M.R.: 1990, 'BARCAerosols Generation/Inhalation System', Indian Aerosols Sci. Technol. Newslett. 3, 38.Google Scholar
  8. Sehmel, G.A.: 1980, 'Particle and Gas Dry Deposition a Review', Atmos. Environ. 14, 983–1011.Google Scholar
  9. Simonds, J.R. and Linsely, G.S.: 1982, 'Parameters for Modeling the Interception and Retention of Deposit from Atmosphere by Grain and Leafy Vegetables', Health Phys. 43, 679–691.Google Scholar
  10. Singhal, R.K., Narayanan, U. and Bhat, I.S.: 1994, 'Evaluation of Interception and Translocation of Mn & Co in Fenugreek, Potato & Okra Plant in Tropical Environment', Health Phys. 67(5), 529–534.Google Scholar
  11. Till, J.E. and Meyer, H.R.: 1983, Radiological Assessment NUREG/CR-3332 ORNL, pp. 542–549.Google Scholar
  12. UNSCEAR: 2000, Source & Effect of Ionizing Radiation, United Nations, New York. Vol. 1, pp. 30–40.Google Scholar

Copyright information

© Kluwer Academic Publishers 2004

Authors and Affiliations

  1. 1.Environmental Studies Section/Health Physics DivisionBhabha Atomic Research CenterMumbaiIndia-

Personalised recommendations