The Experts below are selected from a list of 48 Experts worldwide ranked by ideXlab platform
Unknown - One of the best experts on this subject based on the ideXlab platform.
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DEVELOPMENT OF AN ON-LINE, REAL-TIME ALPHA Radiation Measuring Instrument FOR LIQUID STREAMS
1999Co-Authors: UnknownAbstract:Thermo Power Corporation has proven the technical viability of an on-line, real-time alpha radionuclide Instrument for aqueous sample analysis through laboratory and initial field tests of the Instrument. The Instrument has been shown to be isotonically sensitive to extremely low (ten parts per trillion, or femto Curies per liter) levels of a broad range of radioisotopes. Performance enhancement and other scaling data obtained during the course of this investigation have shown that on-line, real-time operation is possible, with a sub 30-minute response time analyzing 20 ppb (30 pCi/1) natural uranium. Now that these initial field tests in Oak Ridge, Tennessee have been successfully completed, Thermo Power plans to conduct comprehensive field tests of the Instrument. The purpose of these endurance tests will be to determine the endurance characteristics of the Thermo Alpha Monitor for Water when it is used by non-Thermo Power personnel in a series of one or more extended field tests. Such endurance testing is the vital next step towards the commercialization of the Alpha Monitor. Subsequently, it will be possible to provide the DOE with an Instrument that has the capability of obtaining rapid feedback about the concentrations of alpha-emitting isotope contamination in effluent water streams (Subsurface Contaminants Focus Area). It will also be useful for process control of remediation and D and D operations such as monitoring scrubber/rinse water radioactivity levels (Mixed Waste, Plutonium and D and D Focus Areas)
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DEVELOPMENT OF AN ON-LINE, REAL-TIME ALPHA Radiation Measuring Instrument FOR LIQUID STREAMS
1999Co-Authors: UnknownAbstract:The US Department of Energy (DOE) has expressed a need for an on-line, real-time Instrument for assaying alpha-emitting radionuclides (uranium and the transuranics) in effluent waters leaving DOE sites to ensure compliance with regulatory limits. Due to the short range of alpha particles in water ({approximately}40 Im), it is necessary now to intermittently collect samples of water and send them to a central laboratory for analysis. A lengthy and costly procedure is used to separate and measure the radionuclides from each sample. Large variations in radionuclide concentrations in the water may go undetected due to the sporadic sampling. Even when detected, the reading may not be representative of the actual stream concentration. To address these issues, the Advanced Technologies Group of Thermo Power Corporation (a Thermo Electron company) is developing a real-time, field-deployable alpha monitor based on a solid-state silicon wafer semiconductor (US Patent 5,652,013 and pending, assigned to the US Department of Energy). The Thermo Water Alpha Monitor will serve to monitor effluent water streams (Subsurface Contaminants Focus Area) and will be suitable for process control of remediation as well as decontamination and decommissioning (D and D) operations, such as monitoring scrubber or rinse water radioactivity levels (Mixed Waste, Plutonium, and D and D Focus Area). It would be applicable for assaying other liquids, such as oil, or solids after proper preconditioning. Rapid isotopic alpha air monitoring is also possible using this technology. This report details the program's accomplishments to date. Most significantly, the Alpha Monitoring Instrument was successfully field demonstrated on water 100X below the Environmental Protection Agency's proposed safe drinking water limit--down to under 1 pCi/1. During the Field Test, the Alpha Monitoring Instrument successfully analyzed isotopic uranium levels on a total of five different surface water, process water, and ground water streams (the primary water types of interest to the DOE). As an example of the user demand for such an analytical Instrument, a portion of the Field Test for the Alpha Monitoring Instrument was on the DOE's Oak Ridge Reservation, at two test locations in the Y-12 Site's Bear Creek Valley
Chang-woo Lee - One of the best experts on this subject based on the ideXlab platform.
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The Establishment of an In-Situ Real Time Radiation Contour Mapping Technique
Journal of Nuclear Science and Technology, 2008Co-Authors: Hee Reyoung Kim, Wanno Lee, Mun Ja Kang, Kun Ho Chung, Young Hyun Cho, Geun Sik Choi, Chang-woo LeeAbstract:The goal of this study is to present that an in-situ Radiation dose distribution on an area measured by using a gamma Radiation Measuring Instrument is grasped without a delay. Fundamentally, the test includes an area map as well as real numerical data from the measured area. The map is a computer file with a format of ‘bmp’ which is used in the gamma Radiation Measuring Instrument, and the data is a text file which has numerical values of the latitude, longitude and Radiation dose rates of the measured points. The Radiation dose rates of the unmeasured points in the area are displayed through an interpolation with those of the measured ones. A 2D plot shows the contour lines with an overlapped map image and a 3D one gives contour lines on the z-axis for an immediate understanding of the Radiation level. It is available to optionally display the numerical values of the Radiation dose rates and to zoom up and down the image of a certain part for a detailed view. This contour mapping method programmed by us...
Luo Jing - One of the best experts on this subject based on the ideXlab platform.
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Performance testing and practical application of FJ-2603G α and β weak radioactive device.
Modern Preventive Medicine, 2010Co-Authors: Wu Yun, Pu Dengrong, Luo JingAbstract:[Objective] To perform testing and practical application for FJ-2603G low α and β weak Radiation Measuring Instrument, so as to complete investigation and monitoring of tap water and source water at the basis of the level of the total α and total β in Nanchong. [Methods] We tested the efficiency, background, the efficiency of long-term stability and the end of long-term stability of the apparatus. We measured the total α and β value in source water, finished water and water samples of Network peripheral in the 5 water plants of Nanchong. [Results] The detection efficiency of Instrument for the 2л of 239Pu α source was ≥ 80%, and the end was ≤ 0.003 cpm; The detection efficiency of the 2π of 90Sr-90Y β source was ≥ 30% and the end was ≤ 0.052 cpm; the efficiency of long-term stability of R were 1.49% (total α Road) and 1.15% (total β Road) and the variation Vb at the end of long-term stability of the measurement for αand β were 0.723 and 0.205, respectively. [Conclusion] The above performance indicators in line with national standards, which would be capable of detecting the radioactive of the totalαand total β value in tap water and source water.
Hee Reyoung Kim - One of the best experts on this subject based on the ideXlab platform.
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The Establishment of an In-Situ Real Time Radiation Contour Mapping Technique
Journal of Nuclear Science and Technology, 2008Co-Authors: Hee Reyoung Kim, Wanno Lee, Mun Ja Kang, Kun Ho Chung, Young Hyun Cho, Geun Sik Choi, Chang-woo LeeAbstract:The goal of this study is to present that an in-situ Radiation dose distribution on an area measured by using a gamma Radiation Measuring Instrument is grasped without a delay. Fundamentally, the test includes an area map as well as real numerical data from the measured area. The map is a computer file with a format of ‘bmp’ which is used in the gamma Radiation Measuring Instrument, and the data is a text file which has numerical values of the latitude, longitude and Radiation dose rates of the measured points. The Radiation dose rates of the unmeasured points in the area are displayed through an interpolation with those of the measured ones. A 2D plot shows the contour lines with an overlapped map image and a 3D one gives contour lines on the z-axis for an immediate understanding of the Radiation level. It is available to optionally display the numerical values of the Radiation dose rates and to zoom up and down the image of a certain part for a detailed view. This contour mapping method programmed by us...
Wu Yun - One of the best experts on this subject based on the ideXlab platform.
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Performance testing and practical application of FJ-2603G α and β weak radioactive device.
Modern Preventive Medicine, 2010Co-Authors: Wu Yun, Pu Dengrong, Luo JingAbstract:[Objective] To perform testing and practical application for FJ-2603G low α and β weak Radiation Measuring Instrument, so as to complete investigation and monitoring of tap water and source water at the basis of the level of the total α and total β in Nanchong. [Methods] We tested the efficiency, background, the efficiency of long-term stability and the end of long-term stability of the apparatus. We measured the total α and β value in source water, finished water and water samples of Network peripheral in the 5 water plants of Nanchong. [Results] The detection efficiency of Instrument for the 2л of 239Pu α source was ≥ 80%, and the end was ≤ 0.003 cpm; The detection efficiency of the 2π of 90Sr-90Y β source was ≥ 30% and the end was ≤ 0.052 cpm; the efficiency of long-term stability of R were 1.49% (total α Road) and 1.15% (total β Road) and the variation Vb at the end of long-term stability of the measurement for αand β were 0.723 and 0.205, respectively. [Conclusion] The above performance indicators in line with national standards, which would be capable of detecting the radioactive of the totalαand total β value in tap water and source water.
