Reconstruction of composition of the Chernobyl radionuclide fallout in the territories of Russia

"Radiation and Risk", 1994, vol. 4, pp. 39-61


Pitkevich V.A., Shershakov V.M.1, Duba V.V., Chekin S.Yu., Ivanov V.K., Vakulovski S.M.1, Mahonko K.P.1, Volokitin A.A.1, Tsaturov Yu.S.2, Tsyb A.F.
Medical Radiological Research Center of RAMS, Obninsk;
1 Science and Production Association "Тyphoon" of Roshydmet, Obninsk;
2 Chernobyl State Commitee of Russia


Paper presents original results of reconstruction of the radionuclide composition of the Chernobyl fallout in the territories of Russia. Reconstruction has been carried out by means of statistical analysis of the data on gamma-spectrometry of 2867 soil samples collected in the territories of Ukraine, Belarus and Russia from 1986 to 1988. To verify the data aggregated estimates of the fuel composition of the 4-th block at the moment of the accident available from literature have been used as well as the estimates of activity released to atmosphere. Resulting correlation and regression dependencies between activities of radionuclides most contributing to the dose formation (137Cs, 134Cs, 131I, 140Ba, 140La, 95Zr, 95Nb, 103Ru, 106Ru, 141Ce, 144Ce, 125Sb.) have been obtained. Statistically significant regression relations between different pairs of radionuclides (including analysis of "noise" contribution to the data) depending on the distance between the point of the sample collection and power station are presented in the paper for the "north-east track" - northern part of 30-km zone, southern part of the Gomel district (Belarus), Briansk, Kaluga, Tula and Orel districts (Russia). Results of reconstruction of relative surface contamination with 131I isotope for about 7000 population points of Russia are given in the appendix 1, part 2 of present issue.

Key words
Radionuclide composition of depositions, the territory of Russia, the Chernobyl accident, statistical analysis, gamma spectrometry data, soil samples, dose-forming radionuclides, 137Cs, 134Cs, 131I, 140Ba, 140La, 95Zr, 95Nb, 103Ru, 106Ru, 141Ce, 144Ce, 125Sb.


1. Chernobyl: radioactive contamination of natural environments / Ed. Yu.A. Israel St. Petersburg: Gidrome-teoizdat, 1990.

2. Jantunen M. et al. Chernobyl fallout in southern and central Finland//Health Physics. 1991. V. 60. N. 3. P. 427-434.

3. Makhonko K.P., Kozlova E.G., Silantyev A.N. and others. Pollution of the terrain 131I after the Chernobyl accident and evaluation of the upper dose loads from its radiation // Atomic energy. 1992. T. 72. Bip. 4. P. 377-382.

4. Begichev C.H., Borovoy A.A., Burlakov E.V. and others. Fuel of the reactor of the 4th block of the ChNPP: Preprint IAE-5268/3. Moscow 1990.

5. Kirchner G., Noack C. Core history and nuclide in-ventory of Chernobyl core at the time of accident// Nucl.Safety. 1990. V. 29. N 1. January-March. P. 1-5.

6. Gudiksen P.H. et al. Chernobyl Source Term, Atmos-pheric Dispersion, and Dose Estimation// Health Physics. 1989. V. 57. N. 5.

7. Calculation of the radionuclide composition of the fuel of the 4th power-generating unit of the Chernobyl NPP, carried out under the WIMS-D and SHAES program, CE ESC RRC Kurchatov Institute-Institute: Reference dated 10/20/87.

8. Information about the accident at the Chernobyl nuclear power plant and its consequences, prepared for the IAEA // At. energiya. 1986. T. 61. B. 5. P. 301-320.

9. The accident at the Chernobyl nuclear power plant and its consequences. Materials for the meeting of experts of the IAEA from 25-29 August 1986 Part 1. Vienna: IAEA.

10. Markushev B.M. Information about the nuclide composition of the fuel of the 4th block of the Chernobyl NPP: OG RRC "Kurchatov Institute" in Chernobyl. 1987.

11. Kolobashkin V.M., Rubtsov P.M., Ruzhansky P.A. et al. Radiation characteristics of irradiated nuclear fuel. M.: Energoatomizdat, 1983. P. 384.

12. Ermilov A.P., Ziborov A.M. Radionuclide relations in the fuel component of radioactive fallout in the near zone of the Chernobyl NPP // Present. Radiation and Risk Bulletin.

13. Buzulukov Yu.P., Dobrynin Yu.L. Release of radio-nuclide of Chernobyl accident// In "The Chernobyl papers" (Ed. M.I. Balonov), Research Enterprises Publishing Segment, USA. 1993. V. 1. P. 3-21.

14. Khan S.A. The Chernobyl Source Term: A Critical Review//Nucl.Safety. 1990. V.31. N. 3. P. 353-374.

15. Handbook of applied statistics. In 2 tons. Vol.1 / Ed. E. Lloyd, W. Lederman; Per. from English by ed. Yu. N. Tyurin. M.: Finance and Statistics, 1989. P. 271.

16. Owen D. Collection of statistical tables: Trans. from English M.: EC of USSR Academy of Sciences, 1966. P. 424-425.

17. Schematic map: distribution of 131I content in the soil on May 10, 1986 on the territory of the Republic of Belarus, Glavgidromet, Center for Radiation Control and Monitoring of the Natural Environment. Minsk: Skorina, 1991.

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