The paper presents a complex of nuclear-physical methods developed in the Institute of Nuclear Physics of Kazakhstan National Nuclear Center for the investigations of the rate, character and peculiarities of contamination with radionuclides of the Semipalatinsk Nuclear Test Site (SNTS). The developed method combines both macroinvestigations (radionuclide analysis, NAA, XRFA, ESR- and NGR-spectroscopy) and microinvestigations (MS, micro-PIXE, electron microscopy). The results of the investigations at the main SNTS test sites “Opytnoye pole' and “Degelen' are presented.
Authors:K. K. Kadyrzhanov, S. Khazhekber, V. P. Solodukhin, S. N. Lukashenko, I. V. Kazachevskiy, Ch. Rofer, V. L. Poznyak, B. B. Knyazev, M. K. Knatova, L. M. Nazarenko, and E. M. Yakushev
The International Data Centre of the Comprehensive Nuclear-Test-Ban Treaty Organisation receives atmospheric radioactivity data from the monitoring stations of the International Monitoring System. The Centre is a processing hub through which raw data and analysis results flow to Treaty Member States. Data are processed automatically upon receipt, and then interactively reviewed and screened for detection of CTBT-relevant radionuclides. Atmospheric back-tracking for source location is included in the IDC functions. This paper describes the role of the IDC in this verification effort, the types of radionuclide monitoring data received, the automatic and interactive processing, and the products distributed to Member States.
Authors:K. K. Kadyrzhanov, D. S. Barber, V. P. Solodukhin, V. L. Poznyak, I. V. Kazachevskiy, B. B. Knyazev, S. N. Lukashenko, S. Khazhekber, J. D. Betsill, and H. D. Passell
As part of an international collaboration (the Navruz Project) between Kazakhstan, Kyrgyzstan, Tajikistan, Uzbekistan, and the United States of America on transboundary river monitoring, the Radiometric Laboratory of the Institute of Physics in Kyrgyzstan measured the isotopic composition of uranium (as measured by &, the ratio of activities of 234U/238U) for the water of the Naryn River basin. This ratio varies from 1.5 to 1.9 due to natural causes. The results point to the lack of the technogenic uranium along the Naryn River through territory of the Kyrgyz Republic and to the contamination of the Mailuu-Suu River by technogenic uranium from tailing dumps in the area. The share of technogenic uranium transported to Uzbekistan does not exceed 30&, and the total uranium content is considerably lower than the maximum admissible concentration (MAC) and is almost an order of magnitude lower than that of potable waters of the Chui Valley of Kyrgyz Republic.
Authors:B. S. Yuldashev, U. S. Salikhbaev, A. A. Kist, R. I. Radyuk, D. S. Barber, H. D. Passell, J. D. Betsill, R. Matthews, E. D. Vdovina, L. I. Zhuk, V. P. Solodukhin, V. L. Poznyak, I. A. Vasiliev, V. M. Alekhina, and A. A. Djuraev
This article presents the results of the investigation on radionuclide contamination, physical and chemical forms of plutonium in soil samples of various zones at the territory of the Semipalatinsk Nuclear Test Site (SNTS), and the analysis of these results in connection with characteristics of the performed tests. There was revealed the character of various sites differing by concentration level, 239+240Pu to 241Am concentration ratios, presence forms, area distribution, and magnetic fractions of transuranic radionuclides.