Authors:V. Solodukhin, V. Poznyak, I. Kazachevskiy, B. Knyazev, S. Lukashenko, and S. Khazhekber
Investigation of radionuclide and element composition of environmental objects such as soil, bottom sediments, water, vegetation
sampled at the Syrdarya river basin in Kazakhstan is presented. Distribution and season variations of radionuclide content
for various objects were studied. Main sources of Syrdarya river contamination were revealed: the tributaries Keles and Badam,
Shieli uranium field.
Authors:I. Kazachevskiy, V. Solodukhin, S. Khajekber, L. Smirin, G. Chumikov, and S. Lukashenko
There is investigated a radionuclide composition of the soil samples, selected in various parts of former Semipalatinsk Nuclear
Test Site (SNTS). The gamma-spectrometric method was used for determination of137Cs and241Am. For determination of90Sr and isotopes of plutonium a radiochemical separation was used. The results of determinations show a distinction in distribution
of radionuclides on depth for various investigated areas and for various size fractions of surface layers. The study of the
size fractions has shown an enrichment of a magnetic faction by241Am.
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.