Both Arc GIS 9.2 and ERDAS 9.1 software were used to analyze the concentrations in radiation exposure of marshlands in southern Iraq during June 2009 and January 2010. It was measured radiation exposure rates above th...Both Arc GIS 9.2 and ERDAS 9.1 software were used to analyze the concentrations in radiation exposure of marshlands in southern Iraq during June 2009 and January 2010. It was measured radiation exposure rates above the soil and water surface, and also measured radioactivity in the environmental models （soil, plants, sediment and water） for all the selected sites of the study area. Furthermore, it has＂ been measuring the level of radioactive contamination concentration of the isotope Bi-214 and Ac-228 and K-40 as well as peer-Cs-137-resulting from the operations of nuclear fission and measured the background radiation compared with other regions. Environmental samples （soil-water-plant-deposits） were taken and measuring the concentration ratio of radioisotopes in using the system account gentle rays Kama multi-channel and using the counter--Nal-tinged element--thallium--Type-WIZARD-1470 as well as a LB 1200. The results showed the regions of the marshes of radioactive contamination now.展开更多
The determination of the effective minimum detectable activity （MDA） of radionuclides by a detection system plays an im- portant role in environmental radiation monitoring. In this study, the responses of an NaI（TI...The determination of the effective minimum detectable activity （MDA） of radionuclides by a detection system plays an im- portant role in environmental radiation monitoring. In this study, the responses of an NaI（TI） airborne γ ray spectrometry （AGRS） system to different radionuclides （137Cs and 131I） were investigated using the Monte Carlo technique. The MDA values were determined under different conditions according to the counting spectra obtained from the Monte Carlo simulation. The equivalent mass thickness method was applied to the Monte Carlo modeling for monitoring ground radiation to reduce sta- tistical uncertainty. The secondary source method was used to monitor both air and ground radiation. A quadratic relationship was found between the MDA and activity concentration. An exponential relationship was found between the MDA and altitude The MDA of a specific radionuclide from external detectors was found to be superior to that obtained from internal detectors under the same conditions. The MDA values in an NaI（Tl） AGRS system under different conditions can be estimated based on the results of this study.展开更多
文摘Both Arc GIS 9.2 and ERDAS 9.1 software were used to analyze the concentrations in radiation exposure of marshlands in southern Iraq during June 2009 and January 2010. It was measured radiation exposure rates above the soil and water surface, and also measured radioactivity in the environmental models （soil, plants, sediment and water） for all the selected sites of the study area. Furthermore, it has＂ been measuring the level of radioactive contamination concentration of the isotope Bi-214 and Ac-228 and K-40 as well as peer-Cs-137-resulting from the operations of nuclear fission and measured the background radiation compared with other regions. Environmental samples （soil-water-plant-deposits） were taken and measuring the concentration ratio of radioisotopes in using the system account gentle rays Kama multi-channel and using the counter--Nal-tinged element--thallium--Type-WIZARD-1470 as well as a LB 1200. The results showed the regions of the marshes of radioactive contamination now.
基金supported by the National Defense Basic Scientific Research Project(Grant No.B2520133077)National High-tech R&D Program of China("863"Program)(Grant No.2012AA061803)
文摘The determination of the effective minimum detectable activity （MDA） of radionuclides by a detection system plays an im- portant role in environmental radiation monitoring. In this study, the responses of an NaI（TI） airborne γ ray spectrometry （AGRS） system to different radionuclides （137Cs and 131I） were investigated using the Monte Carlo technique. The MDA values were determined under different conditions according to the counting spectra obtained from the Monte Carlo simulation. The equivalent mass thickness method was applied to the Monte Carlo modeling for monitoring ground radiation to reduce sta- tistical uncertainty. The secondary source method was used to monitor both air and ground radiation. A quadratic relationship was found between the MDA and activity concentration. An exponential relationship was found between the MDA and altitude The MDA of a specific radionuclide from external detectors was found to be superior to that obtained from internal detectors under the same conditions. The MDA values in an NaI（Tl） AGRS system under different conditions can be estimated based on the results of this study.
