scholarly journals Application of Spectrometric Gamma-Logging for Specification of Characteristics of Soil Radioactive Pollutions

2020 ◽  
Vol 18 ◽  
pp. 105-110
Author(s):  
O. I. Stoianov ◽  
◽  
M. I. Panasiuk ◽  
V. E. Ivanova ◽  
G. V. Levin ◽  
...  
Keyword(s):  
Radioactive Waste ◽  
Soil Contamination ◽  
Radioactive Contamination ◽  
Gamma Ray ◽  
Surface Contamination ◽  
Article Analysis ◽  
Contamination Of Soils

The experience of using the method of spectrometric gamma-logging of wells for assessment of radioactive contamination of soils on the sites of foundation pits excavation for the New Safe Confinement foundations is presented in the article. Analysis of the photopic/Compton ratio in the gamma-ray spectra of the wellbore allowed us to identify the types of soil contamination: the volumetric contamination, which is associated with real radioactive contamination, and the surface contamination, which is identified as introduced by drilling. This task is especially relevant for determining the boundaries of contaminated/clean soils, which had an impact on determining the depth of pits and, as a result, on the volume of soils to be developed. The use of spectrometric gammalogging of wells made it possible to correctly predict the categories and volumes of radioactive waste, which were soil to be extracted during excavation. Directions for further improvement of the method of spectrometric gamma-logging to clarify the characteristics of radioactive waste are considered in the article.

Performance of a DrumScan® HRGS Solo Scanner for the Assay of Legacy Waste at the Belgoprocess Site

2011 ◽  
Author(s):  
Daniel F. Parvin ◽  
Thomas Huys
Keyword(s):  
Radioactive Waste ◽  
Gamma Ray ◽  
Fissile Material ◽  
Long Term Storage ◽  
System Validation ◽  
Current State ◽  
The Uk ◽  
Validation Tests ◽  
Interim Storage ◽  
Acceptance Tests

On the sites of Belgoprocess several thousands of drums containing conditioned legacy waste are stored. A significant number of these waste packages are 220 litre drums containing radioactive waste embedded into inactive bitumen. Most of the radioactive waste in these drums was generated during the development and production of MOX-fuels and the operation of the Eurochemic reprocessing plant. The current state of a number of these packages is no longer acceptable for long term storage. In order to make the waste packages acceptable for interim storage a repackaging process was developed. The process involves the repackaging of the waste items into 400 or 700 litre waste drums and a non-destructive gamma-ray assay (NDA) measurement performed on the new package. The aim of the NDA measurement is to detect significant quantities of fissile material in order to demonstrate compliance with the operational limits of the storage building. Since the waste items are destined for geological disposal, there is no specific need for a detection limit in the order of milligrams of plutonium as required for surface disposal. To meet this NDA requirement Babcock International Group supplied, calibrated and commissioned an open geometry system from its HRGS product range. The DrumScan® HRGS Solo assay system was delivered to the Belgoprocess site in 2009 after completing a series of factory acceptance tests performed in the UK. In May 2009 after successful completion of the site acceptance tests performed in Belgium, the system has been undergoing extensive testing and validation by Belgoprocess in order to demonstrate acceptance and compliance to the Belgian Radioactive Waste Agency, NIRAS/ONDRAF. After a careful evaluation of the qualification file, NIRAS/ONDRAF approved the system for operational measurements at the end of 2010. This paper provides a detailed description of the NDA requirement, calibration methodology, system validation tests and overall measurement performance of the system.

Remedial Action for Radioactive Waste Rock Piles in China

2000 ◽  
Vol 663 ◽  
Author(s):  
Chen Zhangru ◽  
Jin Yuanxin ◽  
Song Lanying ◽  
Wu Qingyan
Keyword(s):  
Radioactive Waste ◽  
Gamma Ray ◽  
Waste Rock ◽  
Chinese Government ◽  
Uranium Deposits ◽  
Remedial Action ◽  
Waste Rocks ◽  
Remedial Actions ◽  
Waste Rock Piles ◽  
The Individual

ABSTRACTThe Chinese government has conducted remedial action for radioactive waste rock piles since 1990. The radioactive waste rocks produced in the course of geological exploration of uranium deposits are widely distributed over several hundreds of locations in more than 20 provinces in China.The following remedial actions for radioactive waste rock piles have been undertaken in China:1. Protecting dams for stabilizing the piles have been built. A total length of about 50,000 m of these dams has been completed.2. Soil layers have been emplaced on the radioactive waste rock piles. The focus of the action is to eliminate the radiation harmful to public health. A total area of 750,000 square meters of soil ahs been placed on the piles in China.3. Radioactive waste rock piles have been vegetated. Aesthetic shaping of the landscape in the exploratory district of the uranium deposits is our expectant goal. A total area of about 560,000 square meters of vegetation has been placed on the soil covering the piles.Through these remedial actions, the environmental situation has been extensively improved in the remedial districts. The individual annual effective dose equivalent is less than 1 Sv/a. The radon emission rate is less than 20 pCi/m2.s. The gamma ray external exposure rate has been greatly reduced.

Low-level radioactive waste measurement comparisons of three gamma-ray counting systems

2013 ◽  
Vol 298 (1) ◽  
pp. 61-65
Author(s):  
Ping-Ji Huang ◽  
Chin-Hsien Yeh ◽  
Huang-Sheng Chiu ◽  
Jyi-Lan Wuu ◽  
Ming-Chen Yuan
Keyword(s):  
Radioactive Waste ◽  
Gamma Ray ◽  
Low Level ◽  
Low Level Radioactive Waste

New xenon gamma-ray spectrometer for sorting of radioactive waste

2016 ◽  
Author(s):  
Sergey E. Ulin ◽  
Alexander S. Novikov ◽  
Valery V. Dmitrenko ◽  
Konstantin F. Vlasik ◽  
Ziyaetdin M. Uteshev ◽  
...  
Keyword(s):  
Radioactive Waste ◽  
Gamma Ray ◽  
Gamma Ray Spectrometer

scholarly journals Assessment of Radiological Contamination of Soils Due to Shipbreaking Using HPGe Digital Gamma-Ray Spectrometry System

2010 ◽  
Vol 01 (01) ◽  
pp. 10-14 ◽  
Author(s):  
Mohammad Kamal Hossain ◽  
Syed Mohammod Hossain ◽  
AKM Moinul Haque Meaze
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Spectrometry ◽  
Contamination Of Soils

scholarly journals ESTIMATION OF THE EFFICIENCY OF THE DRY METHOD OF DECONTAMINATION OF SURFACE CONTAMINATION OF ALPHA-EMITTING-RADIONUCLIDES

2019 ◽  
Vol 98 (8) ◽  
pp. 878-884
Author(s):  
Igor P. Korenkov ◽  
T. N. Lashchenova ◽  
N. K. Shandala ◽  
A. I. Ermakov ◽  
A. B. Mayzik
Keyword(s):  
Cluster Analysis ◽  
Gamma Ray ◽  
Specific Activity ◽  
Germanium Detector ◽  
Decontamination Factor ◽  
Surface Contamination ◽  
Gamma Ray Spectrometry ◽  
Building Structures ◽  
Equivalent Rate ◽  
Ambient Dose Equivalent

The article describes the evaluation of the efficiency of using the technology of dry method of decontamination of α-radionuclides from working surfaces of premises for different materials, equipment and building structures. Materials and methods. Instruments for measuring of ambient dose equivalent rate (ADER) with a lower limit of 0.03 μSv/h. Specific activity of α-radionuclides in the samples was determined by radiometric, radiochemical and spectrometric methods using standard methods in the accredited laboratory. The measurements in situ were also carried out using the ISOCS «CANBERRA» mobile gamma-ray spectrometry system with high purity germanium detector and a collimator. Technological equipment included industrial vacuum cleaner with nozzles; high-pressure device; packing sets for RAW collection; HEPA filters; personal protective equipment. Results. Maps of spatial distribution of surface α-contamination in the building was constructed. We performed cluster analysis of data for zoning of contaminated surfaces. The decontamination factor for porous (brick, concrete), smooth (wood, brown tiles, laminate) and sticky (bitumen, mastic) surfaces was determined. Conclusion. The cluster analysis made it possible to identify 4 levels of surface α- and β- contamination, particles/cm2 ∙ min: zone I - for α- above 50, for β- above 10,000; zone II - for α- 5-50, for β- 2,000-10,000; zone III - for α- no more than 5, for β- 2000; zone IV - corresponds to the background values of the workspace surfaces. The dry decontamination method revealed a high content of fine dust aerosol fraction deposited in the lungs. To increase the efficiency of dust suppression, water aerosol with droplet size of 100 - 400 microns and quartz sand with particle size of 100-200 microns were sprayed at the rate of 200-400 g per 1 m2. The decontamination coefficient depends on the coating material and the level of surface contamination: concrete - 91 to 97.8%; brick - 85-86%, wood - 38.8-53%; brownstone tiles - up to 29%; mastic - 22-28%; bitumen - 15.9-20%. To protect the personnel, radiation-hygienic rationing of PM10 and PM2,5 content is necessary.

scholarly journals Evaluation of migration ability of polychlorinated biphenyls in the «soil-plant» and «soil-earthworms»

2019 ◽  
Vol 95 (4) ◽  
pp. 336-339
Author(s):  
Yuliya I. Baeva ◽  
N. A. Chernykh
Keyword(s):  
Soil Contamination ◽  
Organic Pollutants ◽  
Comparative Evaluation ◽  
Terrestrial Plants ◽  
Migration Ability ◽  
Low Concentrations ◽  
Highly Sensitive ◽  
Contamination Of Soils ◽  
First Time ◽  
The City

In the article there is given a hygienic assessment ofpolychlorinated biphenyls (PCBs) contamination of soils of the city of Serpukhov of the Moscow region. For the first time there was investigated the PCB’s ability to migrate in the system "soil-earthworms", and were calculated bioaccumulation factors at the different level of soil contamination. There was performed a comparative evaluation of the accumulation of given contaminants by higher terrestrial plants and representatives of soil paedobionts (Lumbricidae worms), and revealed clear differences in these processes. There was shown the possibility of the use of earthworms as a highly sensitive bio-indicators in monitoring for soil contamination by persistent organic pollutants, even at low concentrations.

Development of a New Method to Reduce the Measurement Uncertainties in Gamma-Ray Spectroscopy of Bituminized Radioactive Waste Drums

2001 ◽  
Author(s):  
Bertrand Perot ◽  
Jean-Luc Artaud ◽  
Bernard Chabalier ◽  
Pierre Bonifay ◽  
Sébastien Bernard ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Chemical Composition ◽  
Radioactive Waste ◽  
Experimental Validation ◽  
Gamma Ray ◽  
Gamma Spectroscopy ◽  
Low Energy ◽  
The Matrix ◽  
Measurement Uncertainties ◽  
Waste Drums

Abstract The determination by gamma spectroscopy of the activity of radionuclides emitting low energy radiation (less than 200 keV) in bituminized waste drums can be affected by significant uncertainty if the chemical composition of the matrix is not well-known. Indeed, some elements with high atomic numbers (Z) can significantly modify the absorption of these radiations. The CEA has therefore studied, using numerical simulation, the feasibility of a method which would take into account this effect, based on the analysis of the gamma spectra continuum due to Compton scattering (1). This article describes an experimental validation of the simulations and of the method.

Sign in / Sign up

Export Citation Format

Share Document