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Title: Time dependence of the {sup 137}Cs resuspension factor on the Romanian territory after the Chernobyl accident

Abstract

On the basis of the radioactivity levels in aerosol and atmospheric deposition samples due to the Chernobyl accident, the resuspension factor of {sup 137}Cs as a four-parameter function has been inferred. The standard procedure to derive the dependence of resuspension on time assumes that the initial deposit is instantaneous. A simple method assuming a constant deposition rate over a fixed period has been proposed. Also, based on existing experimental data, an attempt was made to consider a realistic time dependence of the deposition rate to cope with the particular case of the Chernobyl accident. The differences between the two models are outlined. The Chernobyl direct deposit has been assumed to be the deposit measured between 30 April and 30 June 1986. The calculated values of the resuspension factor are consistent with the IAEA`s recommended model and depend on the rainfall that occurred in June 1986 and the site-specific disturbance conditions during the first 100 d following 1 July 1986 and only on artificial disturbance by humans and vehicles after that. 16 refs., 5 figs., 3 tabs.

Authors:
 [1];  [2]
  1. Institute of Environmental Research and Engineering, Bucharest (Romania)
  2. National Institute of Meteorology and Hydrology, Bucharest (Romania)
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
39412
Resource Type:
Journal Article
Resource Relation:
Journal Name: Health Physics; Journal Volume: 67; Journal Issue: 2; Other Information: PBD: Aug 1994
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; CESIUM 137; PARTICLE RESUSPENSION; TIME DEPENDENCE; RADIATION DOSES

Citation Formats

Mihaila, B., and Cuculeanu, V.. Time dependence of the {sup 137}Cs resuspension factor on the Romanian territory after the Chernobyl accident. United States: N. p., 1994. Web. doi:10.1097/00004032-199408000-00008.
Mihaila, B., & Cuculeanu, V.. Time dependence of the {sup 137}Cs resuspension factor on the Romanian territory after the Chernobyl accident. United States. doi:10.1097/00004032-199408000-00008.
Mihaila, B., and Cuculeanu, V.. 1994. "Time dependence of the {sup 137}Cs resuspension factor on the Romanian territory after the Chernobyl accident". United States. doi:10.1097/00004032-199408000-00008.
@article{osti_39412,
title = {Time dependence of the {sup 137}Cs resuspension factor on the Romanian territory after the Chernobyl accident},
author = {Mihaila, B. and Cuculeanu, V.},
abstractNote = {On the basis of the radioactivity levels in aerosol and atmospheric deposition samples due to the Chernobyl accident, the resuspension factor of {sup 137}Cs as a four-parameter function has been inferred. The standard procedure to derive the dependence of resuspension on time assumes that the initial deposit is instantaneous. A simple method assuming a constant deposition rate over a fixed period has been proposed. Also, based on existing experimental data, an attempt was made to consider a realistic time dependence of the deposition rate to cope with the particular case of the Chernobyl accident. The differences between the two models are outlined. The Chernobyl direct deposit has been assumed to be the deposit measured between 30 April and 30 June 1986. The calculated values of the resuspension factor are consistent with the IAEA`s recommended model and depend on the rainfall that occurred in June 1986 and the site-specific disturbance conditions during the first 100 d following 1 July 1986 and only on artificial disturbance by humans and vehicles after that. 16 refs., 5 figs., 3 tabs.},
doi = {10.1097/00004032-199408000-00008},
journal = {Health Physics},
number = 2,
volume = 67,
place = {United States},
year = 1994,
month = 8
}
  • Experimental study results are presented for the decrease in the exposure dose rate over time on geographical sections of Belarus contaminated by the Chernobyl accident. Exponential functions of exposure dose rates, with different constants for three time intervals, were calculated and statistically compared to measurements from reference geographical areas. The relations obtained were then used to calculate the gradient of the dose rate in the gamma field. Curves are presented for determining the dose of external gamma irradiation at a given location over the required time interval. 13 refs., 2 figs., 1 tab.
  • Our paper aims to evaluate the quality of high-resolution weather forecasts from the Weather Research and Forecasting (WRF) numerical weather prediction model. The lateral and boundary conditions were obtained from the numerical output of the Consortium for Small-scale Modeling (COSMO) model at 7 km horizontal resolution. Furthermore, the WRF model was run for January and July 2013 at two horizontal resolutions (3 and 1 km). The numerical forecasts of the WRF model were evaluated using different statistical scores for 2 m temperature and 10 m wind speed. Our results showed a tendency of the WRF model to overestimate the valuesmore » of the analyzed parameters in comparison to observations.« less
  • The {open_quotes}Resuspension{close_quotes} scenario is designed to test models for atmospheric resuspension of radionuclides from contaminated soils. Resuspension can be a secondary source of contamination after a release has stopped, as well as a source of contamination for people and areas not exposed to the original release. The test scenario describes three exposure situations: (1) locations within the highly contaminated 30-km zone at Chernobyl, where exposures to resuspended material are probably dominated by local processes; (2) an urban area (Kiev) outside the 30-km zone, where local processes include extensive vehicular traffic; and (3) a location 40 to 60 km west ofmore » the Chernobyl reactor, where upwind sources of contamination are important. Input data include characteristics of the {sup 137}Cs ground contamination around specific sites, climatological data for the sites, characteristics of the terrain and topography, and locations of the sampling sites. Predictions are requested for average air concentrations of {sup 137}Cs at specified locations due to resuspension of Chernobyl fallout and for specified resuspension factors and rates. Test data (field measurements) are available for all endpoints. 9 refs., 4 figs., 11 tabs.« less
  • Short communication.
  • Thyroid screening measurements for /sup 131/I were performed on 58 travelers returning from Eastern and Western Europe to Boston after the Chernobyl reactor accident on April 26, 1986. The travelers consisted of both Americans arriving home after business or vacation and European nationals visiting relatives in the Boston area. For purposes of dosimetry the population was divided into three subpopulations--adult (greater than 18 yr old), children (less than or equal to 18 yr old), and two individuals, 17 and 26 wk pregnant. Seventy-four percent of the population had detectable quantities of /sup 131/I thyroid burdens, ranging from 1 nCi (37more » Bq) to 900 nCi (33,300 Bq). The highest adult radiation dose equivalent was 5.18 mrem (51.8 mSv). The children, however, had considerably higher dose equivalents with one infant receiving 37 rem (370 mSv). Several other children were above 1 rem (10 mSv). The fetal dose equivalents were less than 14 mrem (140 mu Sv). The presence of rain dominated those testing positive for /sup 131/I. Radioactive fallout from the Chernobyl accident contaminated a wide range of Europe and a large population subsequently ingested radioactivity. The children exhibited the highest thyroid radiation dose equivalents of the individuals monitored in the present study. The significance of this is presently unknown.« less