This paper introduces the principles, instrumentation, implementation, and industrial applications of an on- line thermal neutron prompt- gamma element analysis system (using a 252Cf neutron source, Am- Be neutron sou...This paper introduces the principles, instrumentation, implementation, and industrial applications of an on- line thermal neutron prompt- gamma element analysis system (using a 252Cf neutron source, Am- Be neutron source, or neutron generator). The energy resolution of the system at the H prompt- gamma full- energy photopeak (2.22325 MeV) is 3.6 keV. The concentration measurement error of A12O3, Fe2O3, CaO and SiO2 is ±0.3%,±0.1%.±0.4% and ±0.4%, respectively.The system has been tested on- site at both the Shandong and the Zhengzhou Aluminum Works. Our preliminary on- site measurements confirm that the stability, reliability, measurement range, and accuracy of the system can meet the requirements of the aluminum production process. Facilitation of this measurement at aluminum plants is expected to reduce plant costs by over 3 million dollars annually through reduced energy consumption, more rapid qualification of pulps being mixed during the production process, and in reduced labor costs.展开更多
Taking the accurate values of γ energies of <sup>192</sup>Ir as a comparison standard, the mean values of the radiation energies of positron annihilation in silica aerogel with and without oxygen filled h...Taking the accurate values of γ energies of <sup>192</sup>Ir as a comparison standard, the mean values of the radiation energies of positron annihilation in silica aerogel with and without oxygen filled have been measured witha high purity Ge γ spectrometer. The γ energy in parapositronium 2γ decay has been determined and the value of electron rest mass obtained, m<sub>0</sub>c<sup>2</sup>=510998.80±0.74 eV, which is in good agreement with the value recently adjusted within errors.展开更多
文摘This paper introduces the principles, instrumentation, implementation, and industrial applications of an on- line thermal neutron prompt- gamma element analysis system (using a 252Cf neutron source, Am- Be neutron source, or neutron generator). The energy resolution of the system at the H prompt- gamma full- energy photopeak (2.22325 MeV) is 3.6 keV. The concentration measurement error of A12O3, Fe2O3, CaO and SiO2 is ±0.3%,±0.1%.±0.4% and ±0.4%, respectively.The system has been tested on- site at both the Shandong and the Zhengzhou Aluminum Works. Our preliminary on- site measurements confirm that the stability, reliability, measurement range, and accuracy of the system can meet the requirements of the aluminum production process. Facilitation of this measurement at aluminum plants is expected to reduce plant costs by over 3 million dollars annually through reduced energy consumption, more rapid qualification of pulps being mixed during the production process, and in reduced labor costs.
基金Project supported by the National Natural Science Foundation of China.
文摘Taking the accurate values of γ energies of <sup>192</sup>Ir as a comparison standard, the mean values of the radiation energies of positron annihilation in silica aerogel with and without oxygen filled have been measured witha high purity Ge γ spectrometer. The γ energy in parapositronium 2γ decay has been determined and the value of electron rest mass obtained, m<sub>0</sub>c<sup>2</sup>=510998.80±0.74 eV, which is in good agreement with the value recently adjusted within errors.
