Collimated detector technique for measuring a 137Cs deposit in soil under a clean protected layer

Chesnokov, A. V.; Fedin, V.I.; Govorun, A. P.; Ivanov, O. P.; Liksonov, V. I.; Potapov, V. N.; Smirnov, Sergey; Shcherbak, S. B.; Urutskoev, L. I.

doi:10.1016/s0969-8043(97)00108-5

Cited by 36 publications

(9 citation statements)

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“…Radiometric measurements were carried out on a KORAD radiometer with a collimated spectral-sensitive detector, which determines the 137 Cs surface contamination with a spatial resolution of about 2 m 2 at a depth of radionuclide penetration to the soil of up to 30 3 40 cm [11]. Because of the interfering effect of 60 Co and 152, 154 Eu, we were forced to modify the KORAD radiometer, which allowed estimation of the total contribution of the 60 Co and 152, 154 Eu radioactivity through the common surface activity defined as G com = A Co + 0.345A Eu [8].…”

Section: Resultsmentioning

confidence: 99%

“…The measuring procedure used in this work also allowed estimation of the penetration depth of 137 Cs in the soil, i.e., determination of the depth Z (in free path lengths) of a layer containing >80% of the total inventory of 137 Cs [11]. The use of this procedure permits a situation when a contaminated layer is buried under an uncontaminated or conditionally uncontaminated layer L 0 .…”

Section: Resultsmentioning

confidence: 99%

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Distribution of technogenic radionuclides in alluvial sediments and among fractions of the soil in the near zone of the krasnoyarsk mining and chemical combine

et al. 2004

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Distribution of technogenic radionuclides in the landscape of the Berezovyi Isl. (Yenisei River) is studied. The observed variations in the density of radioactive contamination are associated with nonuniform lithologic composition of soil-forming rocks and also with different duration of the flooding periods. Radionuclide distribution in alluvial sediments and among fractions of the soil in the region of the Balchug settlement is analyzed, making emphasis on the contribution of the clay fraction to accumulation of radionuclides.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Distribution of technogenic radionuclides in alluvial sediments and among fractions of the soil in the near zone of the krasnoyarsk mining and chemical combine

et al. 2004

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“…In situ gamma spectrometry was conducted using a COllimated RADiometer (CORAD) instrument (Chesnokov et al, 1997(Chesnokov et al, , 1999Linnik et al, 2000Linnik et al, , 2005. CORAD has a scintillated collimated gamma detector enclosed within lead shielding of approximately 30 mm thickness.…”

Section: Radiometric Methodsmentioning

confidence: 99%

“…CORAD measures the photon flux emitted from the soil surface that is restricted by the solid angle of the collimator (the collimated aperture being w60 ). Measured spectra were recorded using a portable RKG-09N spectrometer (Govorun et al, 1994) and software, developed from mathematical simulation and laboratory experiments, used to calculate the surface activities of gamma-emitting radionuclides ( 137 Cs, 60 Co, 152 Eu and 154 Eu) Chesnokov et al, 1997Chesnokov et al, , 1999. The software also allows the depth at which the majority of radionuclide contamination occurs to be determined, Z, and the thickness of relatively uncontaminated sediment, L 0 , to be determined.…”

Section: Radiometric Methodsmentioning

confidence: 99%

Patterns and inventories of radioactive contamination of island sites of the Yenisey River, Russia

Linnik

Brown

Dowdall

et al. 2006

Journal of Environmental Radioactivity

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“…To verify the homogeneity of the surface soil contamination at the selected experimental areas, we used the Collimated Radiometer (CORAD) device (Chesnokov et al, 1997). This device measures in-situ the 137 Cs deposition and evaluates its penetration depth in the soil.…”

Section: Measurements Of Edr and Of 137 Cs Soil Contamination In-situmentioning

confidence: 99%

Natural restoration of radiopolluted ecosystems and impact on human health

2013

Global NEST Journal

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The vertical migration velocity of radionuclides and the ability of soils components to immobilise them, as the most important parameters of natural-restoration, was studied. The Dose Equivalent Rate (DER) reduction of external ã-radiation was studied in order to assess its impact on human health. The vertical migration velocities of 137Cs and 90Sr in typical soils of contaminated regions in Ukraine (Chernobyl 30-km zone) and Belarus (Gomel region) have been evaluated annually during the last 8 or 10 years since the accident. In most of these soils the migration rate of 90Sr was found to be higher than this of 137Cs and ranged from 0.71 to 1.54 cm year-1 and 0 to 1.16 cm year-1 respectively. At present the main part of radionuclides is located in the upper 10 cm soil layer. The ability of the soil components to immobilise the radionuclides was also investigated from 1989 to 1994 and was found that approximately 57% of 137Cs was converted in fixed forms. It is expected that this percentage will increase to 80% in the next years. Finally, we studied how the DER of ã-radiation, which changes with the migration of radionuclides in the soil, affects the human health. In comparison with 1986, when 100% of 137Cs was distributed on the soil surface, a significant reduction of DER occurred in the studied areas and about ten years after the Chernobyl accident, it ranges from 17.5% to 45%, depending mainly on the level of initial contamination of soils and its migration velocity.

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Collimated detector technique for measuring a 137Cs deposit in soil under a clean protected layer

Cited by 36 publications

References 2 publications

Distribution of technogenic radionuclides in alluvial sediments and among fractions of the soil in the near zone of the krasnoyarsk mining and chemical combine

Distribution of technogenic radionuclides in alluvial sediments and among fractions of the soil in the near zone of the krasnoyarsk mining and chemical combine

Patterns and inventories of radioactive contamination of island sites of the Yenisey River, Russia

Natural restoration of radiopolluted ecosystems and impact on human health

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